Here’s where I put links to fun, interesting, or weird things, including some of my personal projects!

Interactive

A Boggle board & timer that I built with p5.js (the Processing language/framework using JavaScript syntax/notation). Check out the Boggle code. Preview:
Screenshot of a webpage with a button saying "Re-scramble letters!", a timer, and an orange "Boggle board" with 16 letter tiles in a four-by-four grid.
Interactive Pascal’s Triangle, also made with p5.js. See the code for Pascal’s triangle here. Play with it below or view the Pascal’s triangle full-size.

Crochet Sphere Calculator ~ I wrote a JavaScript applet that generates instructions for a crocheted or knitted sphere, given a gauge and desired sphere diameter. Also includes a discussion of how the sphere calculations were done.

Visuals

A Menger sponge (fractal) generator made in p5.js. The Menger sponge is created by subdividing a square into a 3×3 grid  and then removing the centermost square, then repeating the process on the remaining 8 squares, into infinity.A black Menger sponge on a rainbow background: if you take a 3x3 grid of squares, remove the center square; then divide each remaining square into a 3x3 grid and repeat.

Vi Hart is a self-described mathemusician and longtime YouTuber. Vi makes interesting, accessible videos about all sorts of math-related things. If you’re overwhelmed by the variety and not sure where to start, the Doodling in Math Class videos are a good choice.
Simple, beautiful animated map of wind over the continental US. An almost meditative sight.
The continental US in dark gray, with white lines at varying angles and densities representing wind direction and wind speed.

The dance of the factorization diagrams…it may sound dull, but wait til you see it! The patterns get more interesting the bigger the numbers go.
A visualization of the prime factorization of 54, with dots arranged in equal-sized groups.Weird, mesmerizing, and delightful 3D mathematical art by Henry Segerman. If you’ve ever wondered what a 3D printer is capable of, this might start to give you some answers.
A white sphere with cutouts. The light shining from the top center of the sphere projects a pattern of triangles on the floor.

Good Reads

What does math look like to mathematicians? An article about visualizing mathematical ideas.

What Knitting Can Teach You About Math ~ looking at one college professor’s knitting-based math course.

Math riddle:
There is a patch of lily pads covering a pond. The patch doubles in size every day. If it takes 48 days for the patch to cover the whole pond, how long does it take to cover half of the pond?