A bike pulley: they quickly found out this was a little dangerous for the one being pulled.
Here's another view:
A car chute: The boys conducted an experiment to see which car flies out the farthest. It was awesome! They made predictions, charted it, and drew conclusions when they were finished... science in every day, boy life.
The Lego version of the Great Wall of China.
A javalina trap: He was ticked the next morning when the apple was gone and the trap was still set...
Changing flat tires:
And my favorite was the water system he created so he could build bridges for the cars.
It's so exciting, watching Witten learn and grow; watching him fail at some of his inventions and succeed in others. It's going to be fun watching him decide in the years to come on what he wants to be when he grows up.
But Witt, whatever you decide, I hope you love it. I hope you love it as much as you love playing now, when you're six.
Just make sure you love it.