I know that the Enigma contest is dead at this time, but I really loved the idea and sometimes I'm finding objects worth such a game. Normally I have to do macro shots to hide the real thing, but this time I can assure you: it's no macro, in fact it's very big. For those of you who want to play again: the one which solves the riddle should do the next one.
Here you can find former submissions regarding this photo-game:
http://forum.fotothing.com/topic/1539/120#end
And now go ahead: what is it? :)