Model system (M) to illustrate a scientific theory comprising a first frame (1) with an elastic, closed material surface (2),which is arranged within the first frame (1), comprising a second frame (3) having a mesh-like elastic mesh surface (4) having mesh nodes (5) and a mesh structure arranged within the second frame (2), and at least three geometric bodies (6, 7, 8, 9),at least one first body (6),a second body (7) and a third body (8),where each of the first two bodies (6,7) is smaller than a distance of the net nodes (5), so that these two bodies (6,7) fall through the net structure due to the gravitational force when placed on the net structure, where the third body (8) is dimensioned so large that it is held by the net structure, if you place it on the net surface (4).
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