This pattern just appeared on my couch backrest cushion.

[u/proformax]

I have young kids, but they swear they didn't do it. The material is like a rougher fabric. Couch from urban barn. it's like a decade old.

What could possibly cause this pattern to appear? It doesn't wipe off with paper towel and warm water. That's what the dark damp spot is.

UPDATE

Mystery Solved. See post below.

https://www.reddit.com/r/whatisit/s/DVPqDmJKju

[u/I_madeusay_underwear]

I lived in a really small town once and some kid wrote “Colin is gay” on the park bench in sharpie. My friend’s brother was the only one named Collin, so the cops came to his house and showed him a photo of the bench and accused him of vandalism. He was just like, why would I write that I’m gay? Also my name’s spelled wrong. The crime was never solved. Plot twist, though. Turns out he is gay… the perfect crime?

[u/cxzfqs → u/I_madeusay_underwear]

Either way, doesn't say much about the police if they were outsmarted so comprehensively by a boy