On Wednesday evening’s “Blank Canvas,” as part of the NAGB’s continuing series of “Double Dutch,” your host Amanda Coulson (NAGB Director, middle) is visited in the studio by Bahamian artist Edrin Symonette (right) and Jamaican artist Leasho Johnson (left), who speak to their individual artistic practices and their collaborative exhibition, opening on Friday night at 7 p.m. “Of Skin and Sand.”