Why RED BUBBLES are impossible… or are they?!

That was very cool, especially with the strings, but I think there is an error in one of the asides.   It is suggested that the light crests of waves of a given frequency aren't all aligned (in phase), but that cancellation can happen in two-layer reflection between pairs that are. However, let's apply essentially the same argument to the case of single-layer reflection: the light crests aren't all anti-aligned (180 degrees out of phase), but cancellation can happen in single-layer reflection between pairs that are.  That would imply almost no light is reflected from a single layer!  So, one has to either explain double-layer reflection in terms of a single wave solution (wave picture), or interference of a photon with itself (particle picture).