Canon 100/2.8 with reversed 50/1.8 on an adapter ring to get that lovely 2:1 macro :D
In case you can't guess what it is, the macro ratio should give a clue as to the small scale... it's a comb!
Edit: Convert from RAW using auto settings (I'm lazy), resize to 640, convert to mono using the green channel, mess with the levels to deep the shadow and midtones, sharpen lots, save as JPEG.
----- POST CHALLENGE -----
Only one successful guess (congrats to robinssong!), out of 20 attempts? Looks like my puzzle was just too tricky for most of you :o) For the curious, here's a zoomed-out view of what I shot:
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