My 2.5 year old has seen me cutting and shaping bits of wood and metal to make stuff, and occasionally brings me Lego bits and says "Dada cut this!" because he wants a funny-shaped block for something.
He's learned an important lesson. Things in the world can be constructed, things in the world can be destroyed, and all of it - including the world itself - can be *modified*...
When I was a kid I'd paint my bricks the right color if I didn't have enough of the ones I needed or if Lego had decided that bricks in a certain color shouldn't exist. Like green. Which they eventually made of course but when I was a kid those didn't exist at all.
At 2.5 years old that's a great attitude to have, that's one that'll go places :)
My child can manage to break legos. Yet, when I, an adult man, steps on one in the middle of the night it is somehow I who “breaks.” Very odd how these things happen.