Andrew D Hwang
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diffgeom.com
Andrew D Hwang
@diffgeom.com
650 followers 500 following 340 posts
The online shop Differential Geometry: Original Math Designs, at www.diffgeom.com.

"Hwang" rhymes with "song" more or less, he/him: Freelance mathematician, mathematical artist (no machine learning), author, difficult to summarize. I block bots
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diffgeom.com
The same design as earrings:
www.diffgeom.com/product/inti...

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My online shop will be closed the week of January 19. I expect to re-open the week of January 26.

#MathSky #MathArt #SciArt #Jewelry
Photograph of sterling silver earrings, about 5/8 x 7/8 in, each in a single curve that traces two large overlapping circles and a smaller inner circle, resembling an eye.
January 11, 2026 at 4:00 PM
diffgeom.com
My interpretation of linked rings:
www.diffgeom.com/product/inti...
www.diffgeom.com/product/inti...

#MathSky #MathArt #SciArt #Jewelry
Photograph of Intimo Golden, a shiny 1-3/8 in (35mm) tall gold-plated brass pendant that in a single curve traces two large overlapping circles and a smaller inner circle, resembling an eye. Photograph of Intimo, a shiny 1-3/8 in (35mm) tall rhodium-plated brass pendant that in a single curve traces two large overlapping circles and a smaller inner circle, resembling an eye.
January 9, 2026 at 9:30 PM
diffgeom.com
Delicate new earrings are in my shop, and would make excellent budget-conscious last-minute gifts for math-loving people in your life! Shipping within the contiguous US normally takes at most 5 business days.

www.diffgeom.com/product/vola...

More in alt text.

#MathSky #MathArt #SciArt #Jewelry
A pair of delicate natural bronze earrings with a symmetric, pretzel-like appearance. From different viewpoints the appearance changes intriguingly and dramatically. The product page has a virtual animation showing the rotating shape. As shown in the product photograph, the shape may vary slightly from the mathematical ideal. Browse all prototypes and other unique pieces: https://www.diffgeom.com/product-category/jewelry/unique-jewelry/ A pair of delicate polished bronze earrings with a symmetric, pretzel-like appearance. From different viewpoints the appearance changes intriguingly and dramatically. The product page has a virtual animation showing the rotating shape. As shown in the product photograph, the shape may vary slightly from the mathematical ideal. Browse all prototypes and other unique pieces: https://www.diffgeom.com/product-category/jewelry/unique-jewelry/ A pair of delicate rhodium-plated brass earrings with a symmetric, pretzel-like appearance. From different viewpoints the appearance changes intriguingly and dramatically. The product page has a virtual animation showing the rotating shape. As shown in the product photograph, the shape may vary slightly from the mathematical ideal. Browse all prototypes and other unique pieces: https://www.diffgeom.com/product-category/jewelry/unique-jewelry/
December 17, 2025 at 5:46 PM
diffgeom.com
These new earrings are in my shop, and would make excellent budget-conscious last-minute gifts for math-loving people in your life! Shipping within the contiguous US normally takes no more than 5 business days.

www.diffgeom.com/product/vola...

More in alt text.

#MathSky #MathArt #SciArt #Jewelry
An array of eight pairs of colorful, approximately pyramidal nylon earrings. From above, each looks like an equliateral triangle with one vertex downward. From different viewpoints their appearance changes intriguingly and dramatically. The product page shows views from four directions. All my original nylon earrings are on sale through December: https://www.diffgeom.com/product-category/nylon-wearables/
December 17, 2025 at 12:17 AM
diffgeom.com
Over the course of 2022-23, I accumulated several dozen 3D-printed (selective laser sintered nylon) prototypes for jewelry. Here they are as ornaments for a holiday tree in anticipation of the solstice.

#MathSky #MathArt #SciArt
A 7-ft potted holiday tree made from a thin, leafless branch of white birch, adorned with a scattering of about 80 small mathematical forms, mostly white, side-lit by low sun against shadowed snow and evergreen trees. A close-up of a yellow nylon "loxodrome sphere" about 1-1/4 in across suspended from a birch twig against an out of focus snowy background.
December 14, 2025 at 1:43 PM
diffgeom.com
And nonetheless, beauty happens

#MathArt #SciArt
A spot of rainbow falls on the upward-sloping struts of a metal mathematical sculpture.
December 9, 2025 at 1:08 PM
diffgeom.com
Orders to the US normally arrive within 3-5 business days. Orders to the EU or Asia normally arrive within 10-14 days of shipment.

www.diffgeom.com/product-cate...

#MathSky #MathArt #SciArt #Jewelry
A promotional card reading "Differential Geometry diffgeom.com Original Jewelry Designs with photographs of three pendants. Harmonia is a flower-like knot shape with six petals; Agile (the musical term) is a ruffled ring on an abstract soap-film surface; Crescendo is a circular double-band that suggests a breaking wave.
December 8, 2025 at 10:48 PM
diffgeom.com
Orders to the US normally arrive within 3-5 business days.

www.diffgeom.com/product-cate...

#MathSky #MathArt #SciArt #Jewelry
A promotional card reading "Differential Geometry diffgeom.com Original Jewelry Designs with photographs of three pendants. Harmonia is a flower-like knot shape with six petals; Luminoso consists of six linked bands on the surface of an elegantly-asymmetric doughnut; Crescendo is a circular double-band that suggests a breaking wave.
December 8, 2025 at 1:59 PM
diffgeom.com
Through December, all my original nylon designs are at a special low price, with free shipping to the US!

www.diffgeom.com/product-cate...

#MathArt #SciArt #Jewelry #3DPrinting
A pair of undulating black nylon earrings. A pair of undulating blue nylon earrings. A pair of undulating red nylon earrings.
December 6, 2025 at 10:39 PM
diffgeom.com
Through December, all my original nylon designs are at a special low price, with free shipping to the US!

www.diffgeom.com/product-cate...

#MathArt #SciArt #Jewelry #3DPrinting
Pink 20mm nylon earrings in the shape of knotted bands having 7-fold rotational symmetry. Purple 20mm nylon earrings in the shape of knotted bands having 7-fold rotational symmetry. Red 20mm nylon earrings in the shape of knotted bands having 7-fold rotational symmetry.
December 5, 2025 at 7:37 PM
diffgeom.com
Supporting independent artists, craftspeople, and designers is an affirmation of humanity on multiple levels. A page of links to two dozen math-y independent shops:

www.diffgeom.org/misc/math_sh...

#MathSky #MathArt #SciArt
A mathematical surface the size, general shape, and color of a thunderhead looms in a photograph of a sunset sky over water.
December 4, 2025 at 4:43 PM
diffgeom.com
Crescendo, named for its resemblance to a breaking wave, depicts the orientable double cover of a Möbius band.

#MathSky #MathArt #SciArt #Jewelry
A circular 1-1/4 in (32mm) sterling silver pendant in the shape of a double band with a twist, polished to a mirror luster and paired with a matching 18-inch chain. A circular 1-1/4 in (32mm) gold-plated sterling silver pendant in the shape of a double band with a twist, polished to a mirror luster and paired with a matching 18-inch chain.
December 1, 2025 at 8:41 PM
diffgeom.com
These two pendants need good homes. Through tomorrow, all my original mathematical jewelry designs are 10% off with the checkout code Bsky2025!

www.diffgeom.com/product/anem...
www.diffgeom.com/product/anem...

Browse all:
www.diffgeom.com/product-cate...

#MathSky #MathArt #SciArt #Jewelry
Photograph of a rounded flower-like mirror-polished gold-plated brass pendant, about 1-1/2in (38mm) across, in the shape of a twisted band with five-fold rotational symmetry. Photograph of Anemone, a flower-like mirror-polished sterling silver pendant, about 1.2in/30mm across, in the shape of a twisted band with seven-fold rotational symmetry.
November 29, 2025 at 9:40 PM
diffgeom.com
Through November, use the code Bsky2025 at checkout for 10% off all my original mathematical jewelry designs! "Intimo" (for the musical term) suggests linked rings, but is a trefoil knot.
www.diffgeom.com/product/inti...
www.diffgeom.com/product/inti...

#MathSky #MathArt #SciArt #Jewelry
Photograph of Intimo Golden, a shiny 1-3/8 in (35mm) tall gold-plated brass pendant that in a single curve traces two large overlapping circles and a smaller inner circle, resembling an eye. Also available rhodium-plated. Photograph of Intimo earrings, each a shiny 7/8in (22mm) tall sterling silver loop that in a single curve traces two large overlapping circles and a smaller inner circle, resembling an eye. Side view of Intimo earrings, each a shiny 7/8in (22mm) tall sterling silver loop that in a single curve traces an oval whose lower and upper halves are elegantly entwined.
November 28, 2025 at 10:46 PM
diffgeom.com
Through November, use the code Bsky2025 at checkout for 10% off all my original mathematical jewelry designs! Shown is my newest regular item, Harmonia in sterling silver.
www.diffgeom.com/product/harm...

Browse all:
www.diffgeom.com/product-cate...

#MathSky #MathArt #SciArt #Jewelry
Photograph of Harmonia, a shiny 1-3/8 in (35mm) silver pendant in the looping shape of a stylized flower with six petals. The piece has a shiny inverted trapezoidal bail fitted with a matching chain and sits on a black background.
November 28, 2025 at 1:06 PM
diffgeom.com
🌟🌟🌟🌟🌟 Five stars for @elkement's evocative, hand-drawn ellipsoid designs: beautifully printed, speedily delivered, in daily use!

Check out her online shop
store.elkement.art/en-eur

and those of other independent math-y artists and designers!
www.diffgeom.org/misc/math_sh...

#MathArt #SciArt
Right-hander's view of white ceramic coffee mug decorated with elkement's hand-drawn ellipsoids. Left-hander's view of white ceramic coffee mug decorated with elkement's hand-drawn ellipsoids.
November 27, 2025 at 8:29 PM
diffgeom.com
Through November, use the code Bsky2025 at checkout for 10% off all my original mathematical jewelry designs!

www.diffgeom.com/product/luna...
www.diffgeom.com/product/sele...
www.diffgeom.com/product/cele...

Browse all:
www.diffgeom.com/product-cate...

#MathSky #MathArt #SciArt #Jewelry
Luna, a polished rhodium-plated brass pendant, about 25mm across, in the shape of an elegantly asymmetrical donut striped by diagonal bands, fitted with a silver rope chain and sitting on a black background. Selene, polished sterling silver earrings, about 20mm across, in the shape of an elegantly asymmetrical donut striped by diagonal bands. Celeste, polished gold-plated brass earrings, about 20mm across, in the shape of an elegantly asymmetrical donut striped by diagonal bands.
November 27, 2025 at 1:27 PM
diffgeom.com
Through November, please use the code Bsky2025 at checkout for 10% off all my original mathematical jewelry designs!
www.diffgeom.com/product/viva...
www.diffgeom.com/product/viva...

Browse all:
www.diffgeom.com/product-cate...

#MathSky #MathArt #SciArt #Jewelry
Photograph of Vivace, a polished sterling silver pendant, about 35mm tall, in the shape of a climbing spiral mesh, fitted with a silver rope chain and sits on a black background. Photograph of Vivace sterling silver earrings, with the same shape as the pendant, about 25mm tall.
November 26, 2025 at 9:57 PM
diffgeom.com
Through November, please use the code Bsky2025 at checkout for 10% off all my original mathematical jewelry designs!
www.diffgeom.com/product/harm...

Browse all:
www.diffgeom.com/product-cate...

#MathSky #MathArt #SciArt #Jewelry
Photograph of Harmonia, a shiny 1-3/8 in (35mm) gold-plated brass pendant in the looping shape of a stylized flower with six petals. The piece has a shiny inverted trapezoidal bail fitted with a gold long-and-short loop chain and sits on a black background.
November 26, 2025 at 1:29 PM
diffgeom.com
Through November, please use the code Bsky2025 at checkout for 10% off all my original mathematical jewelry designs!
www.diffgeom.com/product/lumi...

Browse all:
www.diffgeom.com/product-cate...

#MathSky #MathArt #SciArt #Jewelry
Photograph of Luminoso, a polished rhodium-plated brass pendant, about 35mm across, in the shape of an elegantly asymmetrical donut striped by six diagonal bands. The piece has a shiny inverted trapezoidal bail fitted with a silver rope chain and sits on a black background.
November 25, 2025 at 11:43 PM
diffgeom.com
The entire month of November, all my original mathematical jewelry at Differential Geometry is 10% off with the code Bsky2025!

www.diffgeom.com/shop

#Math #MathArt #Jewelry
A virtual scene shows a colorful faceted sphere floating in a twilit winter sky over a range of increasingly rugged dark blue mountains, dusted with five-pointed "snowflakes." In large gold letters with black drop shadows reads "Differential Geometry Holiday Sale 2025."
November 22, 2025 at 12:47 PM
diffgeom.com
Times are hard for small businesses. Please support independent shops, artists, and craftsfolk!

For mathematical jewelry, toys, T-shirts, and posters, here are two dozen independent online shops, including mine:

www.diffgeom.org/misc/math_sh...

#MathSky #MathArt #SciArt #Jewelry #SmallBusiness
A mathematical surface the size, general shape, and color of a thunderhead looms in a photograph of a sunset sky over water.
November 16, 2025 at 7:00 PM
diffgeom.com
Particularly looking forward to coffee tomorrow!

store.elkement.art/en-eur/pages...

#SciArt #MathArt #PhysicsArt
Right-hander's view of white ceramic coffee mug decorated with elkement's hand-drawn ellipsoids. Left-hander's view of white ceramic coffee mug decorated with elkement's hand-drawn ellipsoids.
November 8, 2025 at 11:10 PM
diffgeom.com
Another new nylon earring design: Swirl depicts an angle-preserving flow on the sphere.

www.diffgeom.com/product-cate...

#MathArt #Jewelry #3DPrinting
Green 20mm nylon earrings in the shape of a sphere with five bands swirling diagonally around the poles. Red 20mm nylon earrings in the shape of a sphere with five bands swirling diagonally around the poles.
November 6, 2025 at 11:55 PM
diffgeom.com
There are new nylon earring designs in my online math shop! Anemone is a stylized representation of the complex 2/7-power.

To celebrate, all my original nylon designs are at a special price, which includes shipping to the US.

www.diffgeom.com/product-cate...

#MathSky #MathArt #Jewelry #3DPrinting
Pink 20mm nylon earrings in the shape of knotted bands having 7-fold rotational symmetry. Purple 20mm nylon earrings in the shape of knotted bands having 7-fold rotational symmetry. Red 20mm nylon earrings in the shape of knotted bands having 7-fold rotational symmetry.
November 6, 2025 at 1:00 PM