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When the tennis balls make the target double-over in pain, reducing their measured height, you have demonstrated why observation of quantum phenomena by a detector or an instrument can change the measured results of an experiment. /s

Brilliant. Some key questions for this innovative mega-scale imaging is can one leverage elastic vs inelastic scattering of the tennis balls? Oh - and a coherent phased tennis ball stream (TASER??) could give some interesting phase contrast properties?

Mouseover text: "After initial tests created a series of large holes in the wall of the lab, the higher-power Scanning Tunneling Tennis Ball Microscope project was quickly shut down."