Is this a simple photograph – or is it art? Engineering art, in any case. The photograph of the blue-green ball, which could certainly be framed and used to decorate walls, shows the Earth and the FAST spherical radio telescope in Guizhou, also known as China’s heavenly eye. It has a diameter of an incredible five hundred meters. FAST is the world’s largest single-dish radio telescope and has already discovered 800 new pulsars since it began operations.