Knack is one of the most original titles showcased at Sony's PlayStation meeting tonight and one of the more interesting concepts we've seen in quite a while. Knack features a little robot aiding a human army against alien invaders. Knack himself seems to be made out of some sort of stone and can grow and shrink his body with more material present. You can catch the full trailer here. It's going to be exciting to see how the release of this game plays out — I know it's on my watch list.