The trick is revealed inside the spoiler, click on it only if you really want to know without trying it yourself.
It's a matter of perspective, really. Working from the top corner, when you come back around to the highest step before beginning again, you leave a gap between there and where it would meet the steps, again. Then just position your view to where the gap is closed visually and it looks like a closed loop.
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omggggggg thanks youuuuuuuuuuu D::biggrin.gif::D:D
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