I just tried this neat Visual Search Engine that I heard about from John Batalle.

Have to admit, this search engine is interesting. I like the photos as I have spent a lot of time, on and off, around the World Trade Center, though much less after 9/11.

I wonder how this search engine works - does it use the tagging and metadata in the source code?

This is two objects that are similar in Theme.

And these two are similar in Texture.

Anyone figure out how they did it?