The story shows three children (two boys and a girl) setting up a movie frame projection room. They build a projector with an empty shoebox with two holes the size of a film frame. Inside the box, they
put a burnt-out bulb without its filament and filled it with water. This bulb is used as a lens. When the children are going to do the test with the projector, the girl, in charge of filling the bulb with water, lets it fall and the bulb breaks..