  As a first step towards studying the ability of human crowds and machines to
effectively co-create, we explore several human-only collaborative co-creation
scenarios. The goal in each scenario is to create a digital sketch using a
simple web interface. We find that settings in which multiple humans
iteratively add strokes and vote on the best additions result in the sketches
with highest perceived creativity (value + novelty). Lack of collaboration
leads to a higher variance in quality and lower novelty or surprise.
Collaboration without voting leads to high novelty but low quality.
