This is an interactive visualisation of curved space-time of the theory of general relativity. Space is curved by energy and momentum, i.e. stars and black holes. Light rays take the shortest path (geodesic) through curved space-time. Alternatively one could say that light rays from the object to the camera are not straight lines, but are bended by the heavy masses. Click on one of the chapter buttons to explore a certain aspect of light rays in curved space. Click to edit your own scene including fun effetcs. Put your photo an a star or a wall and distort it by one or more masses. This is a short demo. You can navigate using the touch screen, gamepad controller, or joystick.