Roman numerals, geometry, and a big movie studio all figure in this new blog. #mathsky #edusky #NewYear2026

Sometimes inflation is a good thing. #mathsky #christmas2025

Happy Thanksgiving! #mathsky

That’s @oliviavidaltv.bsky.social holding a Geometiles dodecahedron as part of a story on @mathhappens.bsky.social ! More on the blog: geometiles.com/geometiles-i...

Teachers: you can get Geometiles funded by DonorsChoose! #edusky

New series focusing on building one shape— or family of shapes— at a time. Inspired by @mathhappens.bsky.social. #mathsky #edusky

We’re soft launching a new set for grownups: just 48 half-equilateral triangles, but many building possibilities. Thoughts? #mathsky

The Geometiles pumpkin a patch. #mathsky

This is an entry for the 3rd day of #mathober2025 (polyhedron) and also the 1st day (link). It is a variation on a rhombicuboctahedron with a projection of the Borromean Rings. #mathober #mathsky

Is everyone ready for #mathober? #mathober2025 I am looking forward to everyones takes, art, musing, jokes, etc. Mathober has no rules - do 1 day or 35-or just follow along. Blog: www.fractalkitty.com/mathober-2025/ Just the prompts: mathober.com #indieweb www.fractalkitty.com/content/imag...

This was a fun build. See YouTube caption for link to the blog about it. #mathsky #mathart

A fun cube dissection. #mathsky #mathart

This jumbo size dandelion is called a salsify, to the best of my knowledge. The tiny broom is a single seed. The “heart” has Fibonacci spirals. Could the spherical looking flower be a spherical Fibonacci mapping? Seen in North Rim, Grand Canyon NP. #mathsky #Fibonacci

A visit to a Caltech building that merits its own blog: geometiles.com/pi-lights-an... #mathart #mathematicalart #mathsky

Some piñata inspired polyhedra for #CincoDeMayo2025 ! #mathart #mathematicalart #mathsky

Look what the #easteregghunt turned up! #mathsky #edusky #mathart

My most recent homage to #eggs— the bottom is half of an icosidodecahedron, and the top is part of a rhombicosidodecahedron. #mathsky #edusky #mathart

Bon appetit! 🍳 . . #AprilFools #AprilFoolsDay #mathsky #mathart

It's #NationalQuiltingMonth ! What better time to incorporate math teaching and quilting. Read our new blog:https://geometiles.com/quilting-blocks-and-geometiles-old-meets-new #mathsky #edusky #mathart

Day 22 of #mathartmarch inspired me to make this section of a torus with a #hexagon shaped cross section. #mathsky #mathart

Day 17 of #mathartmarch entry: symmetry. This pattern is called “Night Sky” and was designed by Julie Herman of Jaybird Quilts. #mathsky #mathart

Celebrating #nationalquiltingmonth with two classic quilting blocks: the Sawtooth Star and Dutchman’s Puzzle. Geometiles allow you to create these patterns quickly so that you can focus on their geometry even if you don’t know how to sew. See Geometiles.com/quilts for examples. #mathsky #edusky

Celebrating this year’s Pi(e) Day with this fluted number! It comes with its own pie stand, made for the occasion. Watch video to see how two flat surfaces come together to make the pie— or should I say PIElyhedron?? Mobies make the thin pedestal of the pie stand possible. #mathsky #piday2025

Wait for it… this 7 yr old is discovering a new way to play with Geometiles. He’s treating the chain of rectangles as a multi-hinge system, and he finds it “satisfying” to experience the system unfold from a triangle to various other shapes under the effect of gravity. #edusky #mathsky #iteachmath

Yesterday at the @mathhappens.bsky.social booth at the San Diego Festival of Science & Engineering with @nhoskee.bsky.social and blocks by @triangleman.bsky.social and @mathforlove.bsky.social #iteachmath #edusky #mathsky app2.ricoh360.com/viewer/30903...

This #BlackHistoryMonth I’ve been looking at the origins of African American crafts. The pattern in the first picture is inspired by Kente cloth. The cube design is based on the zigzag pattern often seen in African art. #mathsky #mathart #mathematicalart

Mirrored triacontahedron (30-faces) at the @byltbasics.bsky.social store at the local mall. This solid was discovered by Johannes Kepler. It is dual to the icosidodecahedron. #mathsky #mathart

Want a perfect Valentine’s Day gift for the person in your life who likes math and/or building things and/or hearts? Check these out. Geometiles.com/product-cate... .$27 including shipping in US.♥️🤍💙 #mathsky #edusky #iteachmath #valentinesday2025 #valentinesgift

Happy Year of the Snake! #mathart #mathsky #iteachmath #yearofthesnake

At the recent Joint Math Meeting, I ran a contest. “The yellow and green tetrahedra are both completely filled with coffee beans. The yellow one contains 93 beans. How many coffee beans are in the green tetrahedron?” The result may surprise you. #mathsky #edusky #mathed #iteachmath #jmm2025

The last day of the Joint Math Meetings is always bittersweet because that’s when I get to interact with really young mathematicians, but not nearly for as long as I’d like. 9 yr old boy with an elegant structure he designed on his own; girl discovering the #hattile. #jmm2025 #mathsky #edusky

Here's a video set to music of the spherical picture of the octacube structure built by Glen Whitney and Seattle Universal Math Museum at the Joint Math Meetings. #jmm2025 #mathsky #mathart youtube.com/shorts/8KYe7...

Even if you didn’t get a chance to attend #jmm2025, you can experience what it’s like to be inside Glen Whitney’s giant structure thanks to #ricohtheta. app2.ricoh360.com/viewer/aeea7... #mathsky

Kudos to David Weed, of UC Riverside, for winning the coffee bean contest at #JMM2025 ! One of the yellow tetrahedra had 93 coffee beans, and his guess for the number of beans in the green one was 205, just 1 over the correct number. V(green)=2 V(yellow) by Cavalieri’s principle.

DONT MISS THE FUN IN BOOTH 331! #jmm2025

Still catching my breath after the opening reception at the #JMM2025. This star summarizes my experience: raucous geeky fun. Thank you to the person who made this— you’re the first person to build this shape.

At the #jmm2025 ? Try our coffee bean estimating contest before you leave the opening reception.

If you're planning to attend #JMM2025 next week, stop by Booth 331 for a view of the Space Needle and to participate in our Seattle themed estimation challenge. We'll be next to the Math Art Exhibit, where you can see my piece "Full Circles". #mathart #mathematicalart #mathsky

We’re about to embark on a SQUARE YEAR! #mathsky #iteachmath

Just in time for #chanukah2024 , here is an easy to make Geometiles Dreidel. It’s made of eight 30-60-90 triangles and four right isosceles triangles. You need to improvise your own handle for spinning it — I just glued together 4 coffee stirrers. #mathsky #iteachmath #iteachphysics

I recently had the privilege of viewing some original editions of Kepler's work. Along with several @aimathematics.bsky.social mathematicians, we went down into the archives at Caltech and had a personal showing. Read about it here.

A very mathematical play structure in the heart of San Diego. The outside frame is an #icosahedron. Inside, and this is very difficult to see in the picture, are two nested soccer balls.

Looking for a gift under $30? Order on our website this weekend to get your gifts delivered in time for Christmas! Free gift wrap and free shipping the US! www.geometiles.com/shop. #iteachmath #giftsunder30

Rhombicosidodecahedral holiday ornaments! #mathart #mathematicalart #Christmas2024 #iteachmath

Catalan solids by HYBYCOZO at Sensorio. These are duals of the Archimedean solids icosidodecahedron and rhombicuboctahedron. #mathart #mathematicalart