Like teeray mentions, if we can define any knot as a path through a Menger Sponge then that path could be realized in a Minecraft world (since it is cube/block/

Like teeray mentions, if we can define any knot as a path through a Menger Sponge then that path could be realized in a Minecraft world (since it is cube/block/voxel based.) If you placed minecart rails along the knot plot then you could ride it like a roller coaster. Maybe this was the initial motivation for the teenagers.