Seven amazing marble machines by Paul Grundbacher
Seven amazing marble machines by Paul Grundbacher Paul from Thurgau, Swizerland, sent me some pictures of his marble machines. Paul writes: There is nothing to do in the garden in winter, so I have time to tinker. I only worked on one marble machine at a time, and when I had another idea, I continued building, without hurry and only when I felt like it. When I finished, I looked for new ideas ...
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