I had no idea these machines existed. When tasked with writing a ray tracer way back in college, the first thing I did was create a scene description format bas

I had no idea these machines existed. When tasked with writing a ray tracer way back in college, the first thing I did was create a scene description format based on S-expressions. Yesterday I was nostalgically looking at backups of the assignment and found my first scene file: (camera 0 0 -20) ; red sphere (sphere 0 1 50 5 (material (color 255 127 127) 0.8 0.8)) ; green sphere (sphere -20 1 200 9 (material (color 127 255 127) 0.8 0.8)) (plane 0 1 0 20 (material (color 127 127 255) 0.8 0.8)) I went so far as to make the scenes scriptable with Guile. I had another scene that procedurally generated spheres positioned about a helix, but that seems to be lost to the bit gods. To me, there's something very natural about using S-expressions to create graphics. I wish there was a video (with a high enough resolution) that shows the Lisp interactions—especially in the subdivision modeler.