Art.

There should be a scratch-n-sniff gallery. So you can smell art. I imagine Warhol would smell like tin cans or soup. Van Gogh would smell like potatoes and a marina, with a bit of sweat. Frida would smell like dust and heat and hair and Monet would smell like algae. Dali wouldn't be there though- could you imagine the smell of melting clocks and elephants? Which also means Picasso wouldn't be there either- Guernica would be deemed too graphic for olifactory purposes. Maybe then, we'd figure out what the Mona Lisa was smiling about.