Dan Hollick's image on QR code anatomy.

I went down a QR code rabbit hole

It started when I saw this Twitter thread about how QR codes work. (The above image comes from here – made by Dan Hollick.)

But that wasn’t enough. I needed more! Turns out they were invented in the 90s by Denso Wave, which is (or was?) a subsidiary of Toyota. They even have the invention story online.

The American Mathematical Society goes into even more detail.

Finally I found this incredible advanced article on animated QR codes that really blew my mind. Wow.

An animated smiley face QR code that links to the word Awesome.

Just wanted to keep track of these links for later!