My son, the architect

Firstborn has a knack for design. He's demonstrated this before, but it's always fun to see what he comes up with. First up: vehicles for his Angry Birds. One of these vehicles is entirely his design. I made the other one after he was finished, because he wanted me to play with him. Can you guess which one is mine, and which is his?

And here's another view:

Highlight this text to see the answer: The DrillPigCopter is his; the Flying Angry Birdcage is mine.

Then, on Sunday, Firstborn and his grandfather made a turtle out of his Magformers. Firstborn immediately insisted that the turtle needed a house. So...

You kind of have to rip open the wall - er, I mean, "make a door" - in order to let the turtle into the house, though:

Kids are awesome.