If you're in the Piccadilly area this show is well worth a look. Partly because many of the works are pretty and interesting. Party because they're really smartly displayed - each print is on a separate paper pad, so if you like it you can tear off the top one and take it home. That might be very common but I don't get out much so I'd not seen it before. This isn't only a nice way of sharing the art, it also means you can see which ones were popular with other people. Easy, simple interaction.