hold up 1 / 2 / 3 fingers → square / circle / triangle
two pinches on empty space → draw one
two pinches on a block → resize it · squeeze shut → delete
one fist on a block → carry it
one pinch on a block → turn it: up/down tilt, left/right spin, circle steer
carry it to the edge & open → delete it
two fists → move, steer + zoom everything
fists touching → open to wipe · separate to cancel
u undo · c clear · d overlay · h panel · l light
g grid snap · m sound