Escher prints in 3D LEGO versions

Andrew Lipson and Daniel Shiu build faithful, 3D versions of Escher prints using LEGOs: Relativity, Ascending and Descending, Waterfall, and Belvedere. (Only one of those four images required any photo manipulation to create its "Escher effect" — can you tell which one, without scrolling down to see the descriptions on each page?) Other people’s LEGO adventures: a playable harpsichord, the Golden Gate Bridge, and a portrait of Catwoman.