This video, called "The Power of Optics", was created in Japan for high-speed optical internet service provider au Hikari. To make its point, a creative team has built a Rube Goldberg-style machine -- that is, a contraption that is unnecessarily complicated, navigating through a number of manoeuvres in order to complete a relatively simple task -- in this case, refract through a prism to make a spectrum (of course -- it is light, is it not?).
But light is intangible -- it would not be able to trip the more traditional Rube Goldberg mechanisms. Therefore, the team chose mechanisms that required heat -- focus a beam of light tightly enough through a magnifying glass and you end up with a very hot focal point. As the beam travels, bounced through prisms and mirrors, we see it used to burn string, pop a balloon, melt ice, before arriving at its destination point.
It's fiendishly clever -- and, as an added bonus, you can watch a how-to video detailing how the team set the machine up and filmed it.