Hooooooolysh*t. I'm going to five this just for the shear immensity of time and effort that had to go into it, reguardless of the poster. A masterpiece like this deserves no less. Azumanga Daioh isn't really all that great though.
I think I understand. The little green lines represent where the block exists in time. When the green line runs out (at the top left corner of the block) it disapears until the line hits it again. Conservation of mass totally screws this up, but neat picture anyway.
The 4th Dimension is time. Let's say everything in the universe wasn't moving for a second. You're standing in place. You stand in place so long you get old. As you get older, someone takes your picture now and then. You still occupy the same space in three dimensions, but have progressed along the fourth.
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