- Spirolaterals, canvas
- getContext, beginPath, moveTo, lineTo, stroke
- square
- vmin()
- canvas width & height
- onResize, clearRect
- fd(), rt()
- first pattern
- drawing the first pattern
- animating: one_step()
- my robot images, drawImage()
- lots of robots!
- the robot canvas
- robot()
- resize(), clearTimeout
- the buttons
- the buttons' styles