Gravitron
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For the floor I've used 4 Lego-street plates with a curve.
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Photo by Markku Jaaskelainen at Kerava, Finland 2000
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Photo by Markku Jaaskelainen at Kerava, Finland 1999
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Photo by Markku Jaaskelainen at Kerava, Finland 1998
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Photo by Markku Jaaskelainen at Kerava, Finland 1993
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Photo by Markku Jaaskelainen at Espoo, Finland 1984
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