French artist Tania Mouraud likes to make giant black-and-white installations that look like bar codes but are actually just letters written in a crazy font she invented to communicate with aliens. Apparently, aliens don't like to see spaces in between words (or letters, for that matter), but the more educated ones have learned English. Here, Mouraud asks them: "How can you sleep?" A question any decent host would ask their jet-lagged visitors. Click through for another message to our extraterrestrial visitors.

This one was placed near the Centre Georges Pompidou in Paris to explain to the aliens that we're really not that complicated of a race. Image by Thierry Depagne Tania Mouraud via Neatorama