monocycle3.jpg
monocycle1.jpg
monocycle4.jpg
monocycle2.jpg
You may have seen images of this gorgeously crafted “monocycle/monowheel” replica (of an 1873 French design) making its way through the series of tubes. It was for sale, briefly, on eBay (with starting bid at US$13,000).

1873 Monocycle/Monowheel Replica – Link
1873 Monocycle Replica Is a Mechanical and Engineering Marvel – Link