4 code blocks to make color wheels. thin lines result in overlapping gap patterns called "moire" spacebar changes patterns (more moire, and also solid patterns, color spirals, and combinations)
uses thin lines to get the desired gaps, rotates line 1 degree, changes color by 200/360 (color effect range divided by 360 degrees), then stamps. that's 4 blocks or so. then 2 blocks for costume change to see effects of different thickness and color combinations. One of the line costumes is itself a color spectrum strip and makes a yin-yang color wheel swirl and another block to erase
