Today brought a view of this custom special-needs tandem, where the Captain sits in the rear and has full brake and shiting control.
Subsequently I learned that the fabrication had been done by Confluence Cyclery.
More from the portfolio of geek gadgets seen at the shop.
Lights. Computer. Phone. Bell. Video camera. There's just not enough room on your handlebars for both your hands and your beloved gadgets. The solution: KaddyRack
Available in different configurations, these lightweight metal frames give you plenty of space to mount your gadgets and leave your handlebars free for your hands. (website)
They're compatible with eyeglasses / sunglasses and bike helmets. This cyclist was very pleased with them.
Today's geegaw is a rear light that looks (to me) like it should be transporting uranium isotopes or frozen bio samples.
Vizy is a rear light from the Tern Bicycle people. It sends out a bright light (60 lumens) behind the bike for cars to see, and also sends a 360-degree circle of light around the bike to make it more visible and recognizable for the people around it.
It's very reasonably priced as lights go. USB rechargable. website