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"A couple of years I was involved with something called the Twitter Photo Challenge. Every week there'd be a new topic, and the participants had to produce a photo for that topic during the following seven days," said photographer Jo Christian Oterhals.

"A couple of years I was involved with something called the Twitter Photo Challenge. Every week there'd be a new topic, and the participants had to produce a photo for that topic during the following seven days," said photographer Jo Christian Oterhals.