Worlds collide in Beijing-based artist Jia Aili’s huge, apocalyptic paintings at Gagosian Gallery in Chelsea. An ominous, oval-shaped portal appears to generate flashes of lightning and cause a disruption in space and time while to the left, a puffy, cloud-like figure shoots up toward a mysterious black orb. Whether this is an alien-invasion or some kind of terrestrial catastrophe, the drama is deeply absorbing. (On view at Gagosian Gallery’s 21st Street location in Chelsea through April 13th).