Leonardo da Vinci's bicycle

The photo above depicts a modern model based on the drawing (inset below left), in Milan's Codex Atlanticus, which contains the drawings of da Vinci.

[Augusto Marioni] published his discovery in 1974 in a paper delivered precisely in Vinci, the birthplace of Leonardo. Subsequently the bicycle of Leonardo run a brilliant career, it has been also modeled in life size for the Florentine exhibition in honor of the millennium traveling all over the world. Its only fault was the impossibility of being steered. Apparently this minor problem did not excite the master.

It was only in 1997 that Dr. Hans-Erhard Lessing pointed out in a detailed study that the design was a forgery, and a quite recent one at that, drawn into the codex (!) after its restoration in the 60s, more precisely between 1967 and 1974. No trace of it can be seen on the photos made before and during the restoration, only some circles and lines appear through from the other side of the page, and these were complemented into a bike by the forger.

There's more on this subject at Poemas del rio Wang.