I had heard about it, but I had never seen it for myself. The Market Theater in Post Alley at Pike Place Public Market has given up cleaning the gum it's patrons began sticking to the alley's brick wall while they were waiting in line. It's a habit that has literally- stuck. Originally, coins were pressed into the colorful gum blobs, but those quickly disappear. After two complete removals and cleanings, they realized the futility of trying to keep the gum off. It is now become a participatory public art installation that grows daily. I love all the bright colors and was not for one minute grossed out- I loved it!!