# How the heck?

**URL:** <https://forum.kirupa.com/t/how-the-heck/313598>\
**Category:** Uncategorized\
**Created:** [September 3, 2010, 11:38pm UTC](https://forum.kirupa.com/t/how-the-heck/313598 "2010-09-03T23:38:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![FreeHugs](https://avatars.discourse-cdn.com/v4/letter/f/59ef9b/32.png) [@FreeHugs](https://forum.kirupa.com/u/FreeHugs)\
**Post date:** [September 3, 2010, 11:38pm UTC](https://forum.kirupa.com/t/how-the-heck/313598/1 "2010-09-03T23:38:27Z")

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Just getting into stumbleupon (love it) and stumbled onto this [http://www.adverputt.com/](http://www.adverputt.com/)

I thought it was pretty amazing. I’m wondering whether all the collision detection with the edge is actually done in a 3d space or is it all just a very clever illusion? :h: Either way, the effect is some pretty amazing physics…

What do you think guys?