This makes my head hurt

[andrewducker]

Because it's having the same effect on my brain as one of those optical illusions that's both a rabbit and a duck.

Comments

[holyoutlaw]

Here is a large number of similar images, from the "Equilibres" series by Peter Fischli and David Weiss.

Balancing a hammer

[livejournal]

User drdoug referenced to your post from Balancing a hammer saying: [...] the centre of gravity is directly under the end part of the ruler. As mentioned in the comments [...]

[drdoug]

Just posted myself - here's the YouTube video of my version:
http://www.youtube.com/watch?feature=player_embedded&v=BwbPwstyhdM