The 600 Years
The Macula is "a project dealing with the relationship between image, sound and audience." Their goal is to satisfy "audiovisual nihilism" (according to Google Translate). Which could mean, I suppose, to maximize the meaning and purpose between audiovisual and audience interaction.
The Prague Astronomical Clock is "composed of three main components: the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; "The Walk of the Apostles", a clockwork hourly show of figures of the Apostles and other moving sculptures; and a calendar dial with medallions representing the months." The clocks interwoven dials represent:
Video projector mapping works like this: "A number of computer controlled video projector effects are used to project an image on to a desired surface. The projection surface is then mapped into the computer. We can then define various points from the surface and store these into the computer, giving us a selection of ‘maps’. These maps can then be layered with video content, still images, live video feeds, logos, branding etc, to create an ‘interactive’ surface."
Video mapping is a relatively new artform derived from VJing, the realtime manipulation of visual elements (just like DJing is like manipulation of audio elements). Where traditional VJing was stuck in 2-dimensions, video mapping aims to maximize all the dimensions within a space.