I'm nearly certain that it got in there as a coding bogon instead of an intentional effect. However, if I had that same coding bogon myself, then fixed it, I could see adding it back in deliberately because of its effects on the game.
I found that I had to check for collisions every d=1, because otherwise I had pixies fly into walls and embed themselves there. Oops. :)
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I found that I had to check for collisions every d=1, because otherwise I had pixies fly into walls and embed themselves there. Oops. :)