Usually, looking at public art is a fairly passive experience. Often, viewers are completely forbidden from directly interacting with art, much less changing how it looks entirely. But Show Your Stripes by Jim Conti, a glittery piece of public art above a vacant San Jose storefront, is different. It’s pretty enough to look at as-is, when night falls and it’s fully visible. Bars of light flicker across two sides of the building, in shifting designs and hues. But what few locals know is that anyone with a phone can control Show…