The DCT is a cool primitive. By extracting the low frequency coefficients, you can get a compact blurry representation of an image. This is used by preload thumbnail algorithms like blurhash and thumbhash. It's also used by some image watermarking techniques to target changes to a detail level that will be less affected by scaling or re-encoding.
Nature recently posted an interesting video [1] about what causes developing hearts to have their first beat. The gist is that eventually random electrical noise triggers a propagating wave which is then continued and repeated by the cellular automation nature of heart tissue. You don't need as much software if your system is composed of emergent properties.
Ton is a personal hero of mine. When I was a kid, I wanted to be a 3d animator because of Ton. I discovered Blender in the early 2000s as a kid. It was my first exposure to digital art tools because it was free. When Blender open sourced in 2002 it was a massive gift to kids around the world like me. (Ton was kind enough to reply to an email of mine at the time thanking him!)
Ton and Blender have brought so much value to the world by making world-class creation tools available to everyone. Blender is one of the most successful open source projects of all time -- going from an underdog project notorious for difficult to use UI to a polished, ubiquitous, industry shaping tool. And never losing sight of the art; it still brings a huge smile to my face when Blender ships another Open Movie. Nearly ~25 years later, thank you again Ton.
Peak Design mobile case + magnetic desk stand charger + other mounts. My phone is now always charged and I can transition from desktop to car to tripod to bike seamlessly.
I made a notebook a few years back which lets you play with / filter the DCT coefficients of an image: https://observablehq.com/d/167d8f3368a6d602