Ig Nobel prize in 3..2..1..
This is pretty clever, presumably it works because of the specific geometry of the cans used.
Now what would be impressive is if they could make this work with ultrasound, and make a sonic drill that works like the one on "The Core" ...
Someone on LPF suggested using high power infrared laser diode bars mounted on a spindle and rotated at high RPM with a single large lens in front to make this work, sound plausible?
The idea here being that as the diode bar spins the light is focussed in a series of slices onto the workpiece so the end result is the same as a single large laser.
Could also work with a parabolic dish, with the diode bar mounted on the rotating edge facing downwards.