Art doesn’t have to be complicated. In downtown West Palm Beach, the new installation called “Impulse” has filled an open lot at 512 Clematis St., across from Subculture Coffee, with what appears to be a field of 12 lighted seesaws. And that’s what it is. Take a seat, rise and fall, listen to the curious sounds emanating from the seesaw, watch the light change, enjoy. It’s free. After its debut a few years ago in Montreal, with stops in Brussels, London, Chicago and Australia’s Gold Coast, “Impulse” will be in place in West Palm Beach through March 29. Visit DowntownWPB.com/Impulse.