Of it's many names; Projection Mapping, Video Mapping, 3D Mapping, Spacial augmented reality, etc. is the use of projection to change/ distort objects or buildings, to create a visually appealing, often changing 'display surface'. Projection mapping is a great was of displaying media on a huge scale, whilst being inexpensive. I have know that projection mapping is a thing for a long time now, and some of the examples shown are that which I have seen before, however, I never really thought about the logistics behind projection mapping, and the reasons for using it. Back when I was a kid, there was a music festival in my home town, and I distinctly remember one artist setting the whole shopping centre on fire using projection mapping, although at the time, I was just mesmerised by what was happening as opposed to how they did it. I now realise that projection mapping can be related to visual effects, but in real time, live in the flesh. Keeping to the example listed, it would be easy to turn the shopping centre on fire using editing softwares to stick the flames on etc, but as of now, projection mapping is the closest we can get to live visual effects, unless you count augmented reality. I do believe that in the future, more people are going to cotton on to this technology and use it as a cost effective way to set up scenes that may have cost 10x as much were they to actually create it, or put a 500" LCD screen up instead.