Joshua 6:14-15, 20 (RSV) And the second day they marched around the city once, and returned into the camp. So they did for six days. On the seventh day It seems possible that the walls of Jericho may have collapsed due to the resonating frequency produced by soldiers marching around it seven times in lockstep.
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Make a square, split each side into two halves, producing four cells. Put a circle into each cell such that it fills it completely. There is a small gap right in the middle of the square. Put a circle there again such that it touches the other four circles. The central circle is obviously inside the square, right? Yes, but only if the dimension you are in is $D\le9$. Above that, the central cicle actually spills out from the cube, despite the $2^D$ spheres in their cells keeping it in. In this post I present this simple-to-compute yet utterly counter-intuitive result.