giant rafting track marble run

You are the yellow marble on the rafting track.\r
From the entrance it goes 200 cm upwards in a special elevator.\r
Followed by 500 cm of acrylic glass tube.\r
Downwards it goes through a 1500 cm distance.\r
Good luck on the dangerous track.\r
There are already some crashed. \r
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A wooden marble run designed as a rafting track.\r
A work of Ortwin Grüttner \r
Murmiland 2016