This is a video demonstration (below,above is a static image unless you enact a bat-spin) of a 3-D arrow optical illusion that always appears to point right when turned in 180-degree increments (and viewed from the proper angle). In the demonstration, mathematician (and the arrow's creator) Kokichi Sugihara eventually picks the thing up so you can see how it works, or which kind of made my brain harm. "You sure that's not the ice cream sandwich I just watched you try to eat in one bite?" What? "Brain freeze." Huh? "Brain freeze." Huh? "Brain freeze." Huh? "Brain fr-- oh I get it." *wink*
sustain going for the video.
Source: geekologie.com