Cubes have been a part of Minecraft since it was first created, with other shapes - spheres in particular - long thought to be both impossible, and out of place. However, the recent Snapshot revealed a curious quirk in game mechanics that would let you create spheres, rings, and other similar shapes using a trick of redstone, as demonstrated by Logdotzip. Give it a look, and see what you can come up with yourself!
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I'm sorry....WHAT!? Minecraft is squares. What is this madness????? I mean, I don't mind it, but everyone freaked out with when they took away roses and now everyone is like: "Spheres. Cool." I thought I knew you, Internet!!! xD