button_pressed.png source=PhET
button_unpressed.png source=PhET
squeezer_background.png source=PhET
blue_gate_open_icon.png source=PhET
blue_gate_close_icon.png source=PhET
red_gate_open_icon.png source=PhET
red_gate_close_icon.png source=PhET
green_gate_open_icon.png source=PhET
green_gate_close_icon.png source=PhET
