Interesting... but not all that amazing, really. There's a rather glaring error, repeated many times, which many engines suffer from. Twitchy, spontaneous motion:<p>1) at ~23 seconds, look at the top-1/3, left-1/4 location. Chunks of particles <i>literally</i> spontaneously accelerate towards each other. Towards the top-most corner of the top platform, there's even a little snake-like thing that starts inch-worming around for no apparent reason, and a blob that leaps into the air at <i>far</i> higher velocity than it is made of.<p>2) with the 8-second cloth clip, note the twitching as the cloths try to find a stable resting point. Remind you of stacked objects in the Source engine[1], perhaps? Jump on top of them and it's like walking on an earthquake.<p>3) note how long the left block at ~2:40 takes to settle (almost, it doesn't actually), and the weird thrown-on-top chunk that twitches up and down a couple times, and then gets a burst of energy right when it starts fading out, moving <i>up</i>, and <i>faster</i> than the pieces it's touching, and without any visible ripple which could account for it.<p>If it's done by <i>one person</i> (Thiago Costa?), yes, very impressive job, that's a <i>lot</i> of work. But overall... more of the same.<p>---<p>[1]: chosen only because it's a relatively modern engine, and one many are familiar with.