Exhibit: Crazy Crane
The mobile crane is moved by strings which are pulled through the four corner posts. It is very difficult to use because the strings are connected in a non-obvious way to the two control handles. Each control handle is connected to two of the strings in such a way that the movement of the handle does not produce a movement of the crane in the same direction. You have to get used to the peculiar connection system before being able to pick up any of the objects and move them in a chosen direction.