A similar effect can be had by running an argon stream through a hose connected to a distant tesla coil. Hot dangerous arc-plasma will pour from the hose end. Fill an entire small room with Argon or even Neon. Longrange Defacement Ray CO2 lasers of hundreds of watts rating are very small and not that expensive. Drive to a spot with a clear view, use your joystick to set the anamorphed position of your artwork on yon billboard, then hit the return key and slooooowly the original propaganda is modified or replaced by that of your own design.
Ripples also take the form of an expanding circle.
If water ripples could be created as inwards-curving rings, so that they focussed themselves to a point, so much the better. Therefore build a bicycle-powered wave generator which can be placed at the shore of a pond. It would slowly vibrate a long, curved wall which floats half-immersed in the water. When aimed at a distant unwary duck, a series of ripples is created. Or build the device onto a large fountain pool.