Prepare yourselves to be genuinely unsettled, dear readers. Media Molecule released a batch of truly revealing concept art and an animation test, revealing the true reason for LittleBigPlanet's protagonist's plushy composition. Now, we're just guessing, but by the media seen below, we think Sackboy is made of ... well, sack, because it makes him all the more entertaining to squish, crush, immolate and eviscerate. We may never look at him (or his creators) the same way again.

Check out the disturbing concept art in the gallery below, and the even disturbing-er animation reel after the jump.