You know how the human eye takes in raw data, but if that data were not filtered by the brain—“corrected”—then the world would look mad? Chris Engman’s photographs play with that unconscious nano-transaction and the funny fact that, in the field of looking, illusions keep us sane while truths would bring chaos. In Skew, you see the back of what looks like a segment of wall. Engman took the photograph from left and below, and cut the frame to exactly fit the receding plane. Looking at it head-on brings the jarring sensation that you should be standing somewhere else. Throughout this smart show, your brain, eye, and body respond intuitively. (Greg Kucera Gallery, 212 Third Ave S, gregkucera.com, 10:30 am–5:30 pm, free, through May 17)