Be a part of Yoko Ono's #smilesfilm artwork

"My ultimate goal in film-making is to make a film which includes a smiling face snap of every single human being in the world." Yoko Ono, 1967 #smilesfilm is a worldwide participatory artwork by Yoko Ono that shows her longstanding vision of the power of mass participation. First conceived in 1967 as a way of connecting people around the world, Ono's updated 21st-century project invites people to upload images of their smiles to Instagram and Twitter using the hashtag #smilesfilm. Smiles are collated by the #smilesfilm website and app, which are watchable globally and locally – both on a world map and as a film. As Ono puts it: "People from cities and countries around the world can freely upload their smiles by mobile phone and computer to the world and its people. Each time we add our smiles to #smilesfilm, we are creating our future, together. Give us your smile! I love you!" How to contribute to #smilesfilm 1. Take or upload a picture on Instagram (@smilesfilm) or Twitter. 2. Add the hashtag #smilesfilm to the text or tweet. 3. Add your geotag location to appear on the map. 4. That's it! Don't forget to smile! • #smilesfilm is being shown at London's Serpentine Gallery as part of Yoko Ono's show To the Light, which runs from 21 June until 9 September. See Adrian Searle's verdict here . See more from Yoko Ono's Guardian digital takeover here . • As the final part of Yoko Ono's digital takeover, the artist will be picking some of her favourite smiles for a Guardian gallery on Friday 22 June. Come back to theguardian.com/art on Friday to see if your gnashers made the cut.