C - Change colour to the next one from the cyclic sequence: black, blue, green, cyan, red, magenta, yellow, and white.
F - Move forward by one cell and paint the new cell.
R - Rotate clockwise by 45°.
S - Sleep for 20 ms.
[ - Begin a repeatable block and continue executing subsequent code normally.
] - Go back to the beginning of the current repeatable block, repeat it once more, and exit the block. A block bounded by ‘[’ and ‘]’ behaves like a loop that runs twice before the block exits.
[FFF] - A column of 6 white cells.
CC[[[[[[FS]]]]]] - A gradually rising column of 64 cells.
[[[[[[[[FFF]]R]]][[[SSS]]]CC]]] - An octagon that changes colours 8 times.