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Re:Now, I can see wifi signals by rcfox on Saturday February 14, 2015 @09:28PM (#9051581)
I'd guess that it's due to signal reflections causing points of constructive and destructive interference.[0]

The shapes aren't very regular, but that could easily be explained by the shape of the room and its contents.

[0] http://en.wikipedia.org/wiki/Interference_%28wave_propagatio...

Re:Now, I can see wifi signals by rndn on Saturday February 14, 2015 @10:23PM (#9051672)
Is it correct that this is a quantum mechanical effect, i.e. that the wave function of each photon interferes with itself?
Re:Now, I can see wifi signals by vortico on Sunday February 15, 2015 @02:59AM (#9052049)
Well, yes to both questions, but on a macroscopic scale the wave equation can explain the collective effect of zillions of photons to more accuracy than you'll ever need.