At the heart of this raucously colored, bumptiously optical show there’s a longtime (more than 30 years) friendship between the three women artists participating. Add to that equation the decade-long association of Sideshow gallery director Rich Timperio with one of the artists, and you know you’re in for lots of solid experience. But do the works get along? Timperio took a chance that they would when he gave the exhibition the green light a year ago, and it paid off. What’s more, he’s made very good decisions about where to put what.