The bike was made to match a description in the steampunk version of Sherlock Holmes stories, there's a sidecar to go with it. I'll try and find the magazine that had an article on it. Beautiful work.
Steampunk, for those who don't know, is loosely based on 20,000 leagues under the sea, League of Extraordinary Gentlemen type stories. Where the 19th Century, handmade elegance and cogs and gears mechanics are introduced into modern tech, so how Jules Verne would have imagined the modern machinery looking/operating.
A couple of examples:
Steampunked Desktop:
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Steampunked Laptop:
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Steampunked Mouse:

Steampunked Mobile:

They really do make some smart stuff - not too keen on the fashions though, frock coats, top hats with goggles etc....