Boogers

Step 1:  Some gross person puts boogers in a bathroom stall.

Step 2:  I see the boogers.

Step 3:  A little paper and tape later, there are no longer boogers in the stall.  Instead, there is Art. (f. 1)

Step 4:  I come back a week later, and there are MORE BOOGERS. (f. 2)

f. 1 - a collaborative work

f. 2 - a work in progress, apparently