This challenge requires you to take a photo of half of yourself while including an interesting (or not) background. The background can be anything you wish. I suppose you could also call this challenge a 'Half Selfie'
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What is Photinuum?

Welcome to Photinuum! – the free photo-based social networking website that gives you the opportunity to show your uniqueness through other people’s similarity. It’s as easy as creating a User account and uploading your favourite photo, which other Users from around the world will do their best to match. Connect with fellow “Challengers” by commenting on a photo, adding a Friend to your profile, or creating a group with a common interest. Have fun and discover how we may be more similar than we think! Click here for a tour of the site.