Drawing Links! Isometric Paper is fun. 😁 #mathart

You know how geodesic flow on a generic ellipsoid is chaotic...? www.diffgeom.com/product/unis... I sell exclusively at diffgeom.com. If you find my designs elsewhere, they were ... harvested. #MathSky #MathArt #SciArt

Inventory update 080625 Prices in Alt Text instagram.com/p/DNCWiYNogW...

In addition to mathematical jewelry and postcards, I design T-shirts. Here, an abstract binary tree is depicted as recursively-nested pairs of disks with red-gold shading that suggests molten metal. I warmly invite humans to browse! www.diffgeom.com/product/unis... #MathSky #MathArt #SciArt

Now playing with parametric curves. Trying out some new pens/processes. #mathsky

For those of you evaluating real analysis books or self-studying, please consider An Invitation to Real Analysis: www.routledge.com/An-Invitatio... There is a 2-page "Clarifications and Corrections" linked here: diffgeom.org/books/index.... #MathSky #ITeachMath

Seeking unique math gifts for graduates? Here's a list of independent online shops, including mine: www.diffgeom.org/misc/math_sh... Not to speak for others, but if you're able to purchase in these difficult times, we're all Very Grateful for your support! #MathArt #SciArt

Putting my temperature waves watercolor painting in proper historical context - new nostalgic blog posting: elkement.art/2026/05/13/v...

Would be good if performers, musicians, writers, and other creative workers insisted on organisers not using genAI for advertising festivals, shows and events they're taking part in, in solidarity with visual artists, because it's absolutely everywhere at the moment. We need to stick together!

When I was a student, descriptions of multi-valued functions by suitably-joined slit planes rankled. This frame attempts a more accurate portrait for the complex unit circle. The animation is here: mathstodon.xyz/@diffgeom/11... #MathSky #MathArt #SciArt

Typically a trefoil knot has 3-fold rotational symmetry. By suitably rotating a quarter turn in 4-space, however (using stereographic projection to/from the 3-sphere), we can instead arrange 2-fold symmetry about multiple axes: www.diffgeom.com/product/inti... #MathSky #MathArt #SciArt #Jewelry

One frame of an animation loop. #MathSky #MathArt #SciArt

Seeking unique math gifts for graduates? Here's a list of independent online shops, including mine: www.diffgeom.org/misc/math_sh... Not to speak for others, but if you're able to purchase in these difficult times, we're all Very Grateful for your support! #MathArt #SciArt

New art for the art wall outside my office #mathart

Photographs of artist Anne Randolph's "Pondwater" prints are eye-catching (and mathematical), but the full-size prints are positively absorbing! www.pondwaterphotos.com #SciArt

You may have heard that the Banach-Tarski paradox is a consequence of the group of spatial rotations SO(3) having a subgroup that is free on two generators. But what does that look like? Answer: Roughly like this! kyleormsby.github.io/F2-in-SO3/ 1/n 🧮

Do you remember the fun of sending and receiving postal mail? Do your peeps think math is all about computation and formulas? Do you have a Secret Thing for conformal group actions? If so, order a set of math postcards today! www.diffgeom.com/product/you-... #MathSky #MathArt #SciArt

These colorful nylon earrings, "shadows" of a singular disk in complex 3-space, would make a fine graduation gift for a math-loving Someone! I have a limited supply in stock. Price includes shipping within the US. www.diffgeom.com/product/vola... More in alt text. #MathSky #MathArt #SciArt #Jewelry

A blog post explaining the math behind the image "Cyclide Check" in what I hope is a friendly, step-by-step way. This is fun material, especially if you're teaching or taking or otherwise fond of multivariable calc or linear algebra! www.diffgeom.com/blogs/about-... #MathSky #MathArt #SciArt

#MathSky #MathArt #SciArt

Last month I completed a set of mathematical picture postcards. Each is a reminder that math is beautiful and powerful and larger-than-life, yet resides in the mind. Printed for snail mailing, but also suitable as small, inexpensive decor. www.diffgeom.com/product/you-... #MathSky #MathArt #SciArt

Luna has the shape of a cyclide banded by "diagonal" circles. (More in alt text.) I have a small number in stock, and would be delighted to find new happy homes for them! www.diffgeom.com/product/luna... Use "DG1" at checkout through April for 10% off. #MathSky #MathArt #SciArt #Jewelry

My mathematical picture-postcard packs are in stock! www.diffgeom.com/product/you-... If you order from outside the US, please note that US postage is shown initially, and is updated when you enter your shipping address. Postage worldwide is no more than US$7.50. #MathSky #MathArt #SciArt

Planet pendants are back! This past week’s excitement over the Artemis II mission brought to mind this design from a few years ago, and I am making more! Ocean jasper really lends to a planetary feel. The purple is dogtooth amethyst. Nice connection between Earth and space during Earth month. 🐡🎨🌎

The character of this (f)lying kick changes dramatically depending whether the gravity field points downward or inward. 🤔 #MathSky #Physics #Cats #Photography

Help me celebrate 1 year of my shop's new look: Through April, everything at diffgeom.com is 10% off with code "DG1"! <> Luminoso is a 1-1/2 inch (40mm) rhodium-plated brass pendant in the shape of a cyclide banded by "diagonal" circles. www.diffgeom.com/product/lumi... #MathArt #SciArt #Jewelry

When clouds drop below a distant horizon at our elevation or lower, we see curvature of the earth. #MathSky #MathArt #SciArt

"Collaboration," a new postcard design. This is the tenth image in a series of digital overlays. I'm working on packaging these as sets at www.diffgeom.com #MathSky #MathArt #SciArt

Help me celebrate 1 year of my shop's new look: Through April, everything at diffgeom.com is 10% off with code "DG1"! <> Luminoso is a 1-1/2 inch (40mm) rhodium-plated brass pendant in the shape of a cyclide banded by "diagonal" circles. www.diffgeom.com/product/lumi... #MathArt #SciArt #Jewelry

We’ve been experimenting with the transparency toolkit from HeyGears to create optically clear models of radiolarians, microscopic single-celled marine organisms that build intricate glass skeletons with stunning geometric complexity. #sciart #3dprinting (Printer + materials provided by HeyGears)

I did some smaller versions of the physics ink paintings. They need to dry for a while, stay tuned #sciart

"Bubble," a postcard image (digital overlay) depicting a seductive sham of apotheosis. As mathematicians in 2026, we need to be Very Careful we are not inadvertently developing virtual tools of enormous power for those of questionable judgment and inhuman values. #MathSky #MathArt #SciArt

[On the bench today ⚒️ #BehindTheScenes] Small batch of #Voyager pendants nearly done in sterling silver. Final polish next 😎 🔗 sciencesocks.co/prod...#BehindTheScenes]#Voyager🔭🐡🧪🎨

I'm working on a set of mathematical postcards, some entirely digital but several digital overlays on photographs. Here, a conformally-parametrized torus tessellated by regular hexagons looms in an afternoon sky about last Wednesday. #MathSky #MathArt #SciArt

Starting today I'm pronouncing W like "wot": * 1/3 as many syllables * Doubles as MKS unit of power * Most web URLs start with dismayed surprise * "icwu did there"

Working on a set of mathematical postcards, both digital "scenes" and overlays on photos. Here we see the parabola y=x^2, a conic section, as a circle. For now this is a 3-inch matte black self-adhesive sticker: diffgeom.com/products/par... #MathSky #MathArt #SciArt

"Vortex" is a remake of the cover image of "An Invitation to Real Analysis" as a postcard. The looming sky torus is the image of a ray of slope π on a square torus, with color along the ray graded to highlight π~=22/7. www.routledge.com/An-Invitatio... #MathSky #MathArt #SciArt

I am using traditional descriptive geometry and watercolor pencils to turn functions used in physics into cathedrals from stained glass. #MathArt #SciArt

Day ☀️♥️

Harmonia is a 1-3/8 inch (35mm) 18K gold-plated brass pendant in the shape of a torus knot. I have a few left in stock, and would be delighted to find new happy homes for them! www.diffgeom.com/product/harm... More about the math: www.diffgeom.com/blogs/about-... #MathArt #SciArt #Jewelry

Looks like my coloring pages are getting popular on Pinterest again. If you like my Procedural Art coloring pages, inspired by Chemistry and Physics, please buy them from ME instead of someone who stole them from me. www.patreon.com/posts/858020... #SciArt #art #Coloring #ArtForSale

Luminoso is a 1-1/2 inch (40mm) rhodium-plated brass pendant in the shape of a cyclide banded by "diagonal" circles. I have a limited number in stock, and would be delighted to find new happy homes for them! www.diffgeom.com/product/lumi... #MathArt #SciArt #Jewelry

I have a thing for round spheres, not least because 1. extremal Kähler metric, and 2. isometrically embeds in real 3-space. This fetching (if I may say so) digital image arose unexpectedly in January 2026. www.diffgeom.com/product/roll... www.diffgeom.com/product/canv... #MathSky #MathArt #SciArt

Work tasks today included thinking about a magic trick and Catalan numbers at the same time — living the dream!

New post on Fractal Kitty: www.fractalkitty.com/filtering-sn... #mathart #pascalsTriangle #binomialExpansion #mtbos #snowflakes #iteachmath

Copies of "An Invitation to Real Analysis" arrived today. (The book came out last September.) If you're evaluating books for an introductory real analysis course, I'm grateful for your consideration. www.diffgeom.com/blogs/around... www.routledge.com/An-Invitatio... #MathSky

"Anemone" is a shapely motif inspired by complex rational power functions. The sterling silver pendant shown has exponent 2/7. I still have one in stock: www.diffgeom.com/product/anem... Browse all: www.diffgeom.com/product-cate... #MathSky #MathArt #SciArt #Jewelry

Project update: Tanya and I have been writing up the results of this project and we've realized that all of the knots in this class of patterns are at most 6 "tangle moves" from each other and at most three tangle moves from what we're calling the "great-great-granny knot" (see alt text).

For #PrinterSolstice2526 prompt expression: my #linocut of Olga Ladyzhenskaya (1922-2004), 🧪🐡👩🏼‍🔬🎢🧮 #histsci a #mathematician who overcame personal tragedy, faced Soviet totalitarianism & the catastrophic political upheaval of the 20th century to make a huge impact on math, making important 🧵

🌿 White Spiral Planter 🐚 Handmade 3D printed pot in matte white. Modern, minimalist, sculptural design. Fits indoor plants, succulents, or decorative use. With or without drainage hole. 🛒 etsy.com/es/listing/4430718751 #3DPrinted #Planter #Minimalist #HomeDecor #Succulents #Handmade #EcoFriendly