Colleen Venable is obsessed with giraffes (it all started when she lost a giraffe toy as a child, which sets off a 3 year hunt for that particular stuffed animal. Long story short 1,712 giraffes later, she found it!).
As part of her art project The Stalking and Murdering of a Childhood Giraffe Project, Colleen decided to get an "extremely visible invisible tattoo": a connect-the-dot tattoo of the giraffe toy. (She traced the giraffe with a pen for us all to see)
Links: Colleen's Flickr Photoset | LiveJournal account of the whole shebang
http://www.piercingsntattoos.com/visible-invisible-connect-the-dots-tattoos/2007/11/21/