So handsome!

And you look pretty good , David.

Heading out to NYC for an event for MoMath in their brand new space! I'll be guiding people though some fun geometry at @momath.bsky.social 's Family Friday event. bookzoompa.wordpress.com/2026/04/09/a...

Ours are just pushing out of the ground. So glad you think of me when yours are in bloom.

Did they seem to understand square roots after the lesson? Or at least grasp enough to build on?

Playful Math 184: Carnival of Living Math Welcome to the 184th edition of the Playful Math Education Blog Carnival — a smorgasbord of delectable tidbits of mathy fun. It’s like a free online magazine devoted to learning, teachi…

It's always a thrill to see that @denisegaskins.com has visited my blog. I love that Denise links me up with my friends in her carnival. denisegaskins.com/2026/03/25/p...

A small, colorful origami basket, just the right size to hold an egg, or candy, or even a handful of crayons.

Last year, dashing out to a family gathering, I managed to put up a post about making this sweet little origami basket. Looking it over again, I like how, besides folding, it's also about how to work with paper. Such fun to make, to have and to give away. bookzoompa.wordpress.com/2025/04/19/o...

Make Art — Joshua W. Cotter

#makeart www.joshuawcotter.com/words/make-art

Yes.

Just for the record, I agree with David on everything.

It’s one of the few books that I reread multiple times. felt like it illuminated so much that was interesting to know. A hidden history that explained so much.

Ooo! I can get this book through my library system!

Did you read his book Infinitesimal? I liked that book very much, love the deep historical perspective. I don’t know anyone else who read it. It didn’t get good reviews…. Either I have bad taste, or the negative reviews were just because it’s a book about math?

The constraints of the typewriter.

Can’t resist aharing today’s wordle
Wordle 1,714 2/6*

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Paper cubes which have been truncated, pierced and altered in various ways. Some of the negative spaces have been reconstructed.

Towers, or totems, of altered cubes

Am teaching a class right now in which we construct cubes then alter them... Reminds me of the math concept of parents functions which are altered. We then combine the truncated and pierced cubes in fun ways. #mathart #paperengineering

Happy Valentines Day.
Made this in 2018, and still love it.
Loving Triangles.

So super cool!!

I image that your students are thrilled with their work. i predict that they will always joyfully remember this week ?

Folding a polyhedron

Using paper pedestal for an octahedron

Wooden sculpture on paper. PO edestal

Artist @hakoyamaho post models and their nets on Instagram. This one of golden ratio proportioned prisms caught my eye. Makes a cool pedestal for my Minnesota themed octahedron and for a small wooden sculpture by my husband.

I've been hearing from blog readers, in comments and DMs, who have lived in Minnesota, but who are not there now, It's touching how much they appreciate having something to make that honors their connection to the state.

Heartbroken over the events of the past few days. For my Minnesota friends, here is an Octahedron decorated with the color of your flag and your North Star motif. PDF on my blog post bookzoompa.wordpress.com/2026/01/26/s...

It looks like it's easiest to break up just one of the numbers, but not both. It's helpful that you show common mistakes.

I'm thinking that they believe that they've rounded up 300% to 400% of the illegals, and that it is looking like they have detained something 1000% of the worst of the worst. Waiting for verification.

Octagons ornaments with heart decorations, sending out some love in the world. From me to you

Octagon ornaments hanging in my favorite coffee shop.

If the events of the day feel unbearable, I offer a bit of geometry to help you feel grounded. Here's a PDF to make some octagons. drive.google.com/file/d/1bOJ5... Print on card weight paper if you can, glue neighboring tabs together, add string before closing up. #mathart #octahedron #Healing

Good to know that they can wield knives well....? :)

Ahh! I've never feasted on a mobius bagel!! Can't wait.

Summer Projects with Teens It’s not really possible to express how excited I was to be working with teenagers this summer. I saw a group of 6 thirteen-year olds and along with two 18 year- old assistants, who did most …

You probably have it all planned out. Even so, you might enjoy this post of mine from the past bookzoompa.wordpress.com/2019/08/28/s...

7 days, 5 hours each day is a lot of time, for you and for them too! Hope you can balance some quieter explorations with the more dynamic stuff. Are you doing anything with Mobius strips?

Oh! So glad you are doing this!

Note the negative area between the cube and the cuboctahedron to imagine the firm of the differences between the shapes

Just because I like surprises, this cuboctahedron has a hidden compartment which stores the pieces that are the difference between the cube and cuboctahedron.

Here's the cuboctahedron with its irregular tetrahedron corners reattached, reverting the cuboctahedron to its original cubic state. PS I am so glad the Bluesky automatically writes out the word"cuboctahedron" after I write the first four letters of the word! TY

...seeing the space between the octahedron and the cube defines the piece of the cube that has been removed. But why stop there? My cuboctahedron has a secret compartment that stores the liberated edges, which can be examined and reattached.