Web....

[casil403]

...well actually a skylight. If you look at this one long enough your eye gets tricked into seeing it move both outward as well as inward....optical illusion of sorts. I thought that was kinda cool! :)

http://farm5.static.flickr.com/4063/4532680073_c9584ca482_o.jpg

[Bambi]

nicely spotted Casil. I totally see the web!