World 2 · Colours That Are Not There · 10 min · PRO
Three cones, millions of colours
Why a screen can make yellow from red and green
PRO · Illusion Lab
World 2: Colours That Are Not There is part of PRO
The first world of Illusion Lab is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly