Calling for a greener planet: To mark Earth Day on April 22, UK artist Jamie Wardley made a 50-meter painting on a hillside in England. The painting depicts a smiling girl cradling the Earth, with the caption “Vote for Climate, Vote for Our Future”. The artwork was made over three days in Hebden Bridge, in northern England. It uses an optical illusion (错觉) that allows a 2D image to appear 3D when viewed from a particular angle.