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Equal is a see-saw for children, which enables a child to use it even when there is no buddy around. The sand inside of the see-saw acts as a counterweight. If a another child comes to play, the sand can be divided into both sides so that the total weight on both sides is equal. During the movement of the see-saw the sand stays in its position, because the angle of the see-saw stays under 30°-35° (the edge angle of sand). If the sand needs to be moved to the other side of the see-saw, the backrest is used as a lever to exceed an angle of 35°. The transparent cover makes the fascinating visual effect of the sliding sand visible.
Prof. Gunnar Spellmeyer, Prof. Birgit Weller, Herr Horn