I'd paint long strips of canvas and abandon them on the beach, or put bread out in geometric patterns for the pigeons downtown. I wanted people to find something nice and intriguing to puzzle over. Then I'd go back to see if the things were still there, or if anyone would notice.
I'd been doing projects outdoors for the public. I made pigeons eat geometry by putting bread out in rhomboids and triangles. I don't know if this activity made sense, but the work was available.