A Spirograph is a geometric drawing toy that produces mathematical curves. This version consists of various sizes of gears that fit inside each other. A pencil is put into one of the holes of one of the gears and is rotated inside or outside of the other gear.
UP / Down = Increase/decrease the size of the fixed gear.
LEFT / RIGHT = Increase/decrease the size of the moving gear
o = Increase the offset of the pencil
l = Decrease the offset of the pencil
] = toggle whether the rotating gear is inside or outside
r, g, b = Increase the values of colors
Click = stop/start
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