The kids and the staff at Portland Montessori were very helpful.
I brought over a set of BRIDGE BEAMS and let them play around with them.
structure they built was a "building" with an exterior elevator using a windlass.
Next we built a crane with a fixed boom. Watch as the kids use the hand signals to
roll the crane, and then lift a chair.
A couple of the girls designed a "bed" that can be lifted up using the windlass.
the kids used the "elevator" structure to make a catapult.
loaded a projectile into a cardboard box and launched it by jerking on a string.