As far as recent advancements have taken us, we still really don't understand the brain and how it works. Take optical illusions, for example. It doesn't matter how rational we are - our eyes and brains can still trick us into believing something that we know, deep down, can't possibly be right. When you're a kid and you can fit a far-off mountain between your thumb and forefinger, all sensible sense of scale goes right out the window.
The same goes for this astonishing photo, where the photographer has just managed to line up the far-off boat in foggy San Fran through the gap in the chain-link fence. Now, we know that that boat is not a tiny bath toy. And if we look to the bridge for comparison, we can just about convince ourselves of that fact. But here, just for a second, through the hole in the fence, it looks like a boat made for ants.