Now you see it, now you don’t. Works by Picasso, Monet, Gauguin, and Matisse are among the pieces stolen from a Rotterdam museum on Tuesday morning. Police say the Kunsthal museum was robbed at around 3 a.m. local time. It’s unclear how the thieves pulled it off, but investigators are reviewing videotapes of the theft. A spokesman for the Art Loss Register said, “Those thieves got one hell of a haul,” adding that the items would be worth “hundreds of millions of euros” if sold legally at an auction. However, if the thieves sell the art on the criminal market, they would get a much smaller amount.