This wall is near Whole foods and is topped off by railroad tracks. It has been a canvas for graffiti artists many times, giving it a nice varied background. These stay in place about a week or two before the city paints them over.
Susan told me (and I believe her because her authority comes from her grandmother who taught her how to knit, crochet, quilt, sew and play canasta) that these were crocheted into place. Way cool. The barrier (ha!) is supposed to keep people away from the graffiti wall. As if. I missed seeing the previous display but from the amount of paint below the wall it must have had a lot of pink in it.