Conceptual art is usually more about thought than beauty. Not so for Dmitri Obergfell, who creates credible idea-pieces that are also gorgeous. On an intellectual plane, all of the offerings in Yinfinity: New Works by Dmitri Obergfell at Gildar Gallery were based on ancient or familiar symbols like the yin-yang circle, or the double profile of a bust of Janus. What made them beautiful was the artist's use of a custom-car finish called interference paint which, once applied in a mirror-smooth layer, caused the pieces to actually change color as viewers passed by them. It was a tremendously cool effect.