I got that one wrong, too. I'm wondering if it's actually possible to get it right, other than by guessing. Unlike the first ones with the circles and lines, with the Godzilla room distorted in such a way does the image actually contain the information needed to say definitively which is bigger?
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You need to look at the distance the floor is from the roof.
I had seen this before in one of my psychology classes.
It's only "easy" to see, if you're familiar with the experiment IMO.