A while ago I've been watching some TV program (some Italian so I didn't understand a word they were saying) - it was a scientific show, a man was sitting on a stone explaining something about geology obviously, and then the strangest thing - in his hand he was holding some sky-blue plasticin-like amorph mass (more like a bubblegum or clay) - he was shaping it with ease - with one hand, it was almost flowing between his fingers (and I think it was a bit colder weather there so it was even stranger); then he put it on that stone he was sitting on, he took a hammer and hit that blue clay - it broke into pieces like it was ceramic vase; then he picked up fragments and put it all together - it was just like it was before(!) - he was passing it thorough his fingers and shaping it like it was flowing! So it acts both extremely breakable and extremely melleable - at the same time! Strange! My question here: what is that blue clay - what's the deal about it - how come it acts so strange?