As part of the ongoing exhibition Do it, and the publication by the same name, artists were ask to send in instructions on things they want their audience and readers to "Do." Artist, peace activist, musician, and environmentalist Yoko Ono was asked to participate. Her exercise for us: Circulate a picture of your smile to say, "Hello. How you doing?" Its a pretty modest ask, that will likely have a big impact on whomever you choose to send a picture to. Share your results in the comments below.