Apparently even vision experts were surprised by it, it triggered a load of new studies into what was going on. So take *that* all the smug people who thought they had it all figured out on day one.
I never get why so many people get snarky and aloof over illusions in general. What could be more interesting than everyday things that reveal the artifice of what we accept as solid reality??
With this one I am part of the winning crowd because I can hear Laurel and Yanni at will depending on whether I focus on the higher or lower frequencies. It's basically the audio equivalent of one of those drawings that can be two things at once.