What Is It? game 185

It's once again time for our collaboration with the always amusing What Is It? Blog. Can you guess what the pictured item is? Can you make up something interesting?

Place your guess in the comment section below. One guess per comment, please, though you can enter as many as you'd like. Post no URLs or weblinks, as doing so will forfeit your entry. Two winners: the first correct guess and the funniest (albeit ultimately wrong) guess will win T-shirt from the NeatoShop.

Please write your T-shirt selection alongside your guess. If you don't include a selection, you forfeit the prize, okay? May we suggest the Science T-Shirt, Funny T-Shirt and Artist-Designed T-Shirts?

For more clues, check out the What Is It? Blog. Good luck!

Update: This an anvil for hand forming sheet metal with a hammer, for making armor or other curved metal parts, also called sinking or doming. Berhard knew that, and said so in the very first comment! For that, he wins a t-shirt. As for the funniest answer, greg urbano said, "it is a discarded reflecting dish used by aliens to gauge their distance from the earth as they approach for landing, similar to the reflectors we placed on the moon to bouce laser beams back, im almost certain of this because i have seen this on other planets during my travels." However, he did not select a shirt. You can see more picture of this anvil in use at the What Is It? blog.