Matching Wall is an exhibit where you take balls and drop them in one of the holes on the right.  They will roll down the internal ramps and come out behind one of the doors on the left.  Object is to match the word, color, picture, etc. on the right with the door on the left.  The pictures can be changed by the docents for the sake of variety.  The unit can be made 4' x 8', 3' x 6' or just about any size desired.