You can move through the instructions and even zoom in on a part and rotate.

Add a paper pin wheel.  Cut a square, cut half way from each corner, put hole in middle and on 4 corners.
Stick it between two red round blocks.
Test out car in by blowing to see if wheels move freely.
Place in front of fan.

"That thing is going the wrong way."

Actually going towards the fan is the "cool" way.
There are two ways to build the gears and fold the fan
so of the 4 combinations 2 go forward and 2 go away.

Check out the project on different backgrounds.
It can rebuild in 8 seconds.

Many windmills are at SENSORSCITY this month