Alex Warth

Everyone’s seen the Sketchpad demo. Few understand how it actually works.

I reimplemented Sketchpad from scratch, and I’m making short videos that recreate Sutherland’s demos and explain how they work. The first 8 are up — from drawing a line to the famous rivet.

Link below 👇

Yesterday I made a “plaything” for Igarashi et al.’s excellent SIGGRAPH 2005 paper, As-Rigid-As-Possible Shape Manipulation!

Works with a mouse, but it’s much more fun with multi-touch on an iPad.
Link below 👇

You don’t have to just watch my Sketchpad videos — you can follow along in the web browser.

Try the first demo: hold ⌘ and click to draw two lines. Drag an end point of one onto the other. Now move that line and hold the spacebar to solve — the point stays on it.

Link below 👇

@daningalls wanted an LLM inside his Morphic world. He'd put off writing a harness. Then he realized Livelymerge was already multi-user, so the agent could be just another user. An hour later, a morph saying "Hello from Grok 4.5!" appeared on his screen.

Nearly every general-purpose programming language is Turing complete. So ask not what you can do with a language, but what a language makes worth the effort. A short note on "effective expressiveness": inkandswitch.com/malleable-soft…