Sony handmade CD player workshop for elementary schoolers

Oh, so here's what Japanese elementary school kids do during their summer vacation. Sony held a "Handmade CD Player Workshop" at Sony ExploraScience (like SciTrek in Atlanta, but not closed) on the 27th and 28th, where elementary school kids grade 4 and above were asked to create their own "CD" players. The players consisted of a body constructed from two CD storage cases, a wooden rotating platter, and an optical reader unit with an integrated speaker. The discs were made of paper, and featured black-colored "pits" that were read by the optical sensor, which was capable of understand 8 different patterns. At the end of the session, the children were shown some Playstation 2 optical pickups so they could better grasp what they just learned. Now all we need to do is find an easy way to explain the whole HD DVD+-R/RW DL naming scheme mess to them.