Description: Take a pile of pillows to a public space, and invite people to play with each other.
Here’s what I found on the benefits of playfulness in the community! I hope this helps. This thread of articles is similar to the related projects like Eye Bombing, Slip 'N Slide, and Give a Bubble. 
- https://www.researchgate.net/publication/281347286_The_evidence_supporting_the_benefits_of_positive_emotions
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6125010/
- https://www.researchgate.net/publication/27475009_Community_connections_psychological_sense_of_community_and_identification_in_geographical_and_relational_settings
- https://files.eric.ed.gov/fulltext/EJ985548.pdf
- https://www.researchgate.net/publication/262328121_The_Playful_Advantage_How_Playfulness_Enhances_Coping_with_Stress
- https://core.ac.uk/download/pdf/4837475.pdf