Photo & Text © 2011 Seattle Daily Photo. All rights reserved. No use, reproduction, alteration, "pinning" on visual collections websites or republishing in any media.Many Seattle Daily Photo visitors have mentioned how unusual and gross they find the Market Street Theater Gum Wall started in Post Alley in the 1990's to be. This, however, is the granddaddy of all gum walls. It was started in the 1950s in San Luis Obispo, California. The small central coast college and mission town has a narrow alley off Higuerra Street that attracted a gum collection of amazing thickness and age (I learned it has been cleaned off twice at the request of the camber of commerce and this latest collection is only from the early 90s on). Of course we just had to find it. The under layers are. . .ah, shall we say rather black and grody. Several children came through as we watched and matter of factly plopped wads of gum low on the wall, as if it were daily habit. Ew factor. . .pretty big :-). Instead of pennies, people stick their business cards and gum wrappers to the gum. Lots of spontaneous, ah, art, I think.