If some of you ever have the occasion to go to the Toyota commemorative Museum, in Nagoya (Aichi), you will find this:

https://www.tcmit.org/english/research/car/car01

This is the last century version of the item that Asus is presenting here... but with a Gasoline engine.

The Engine is fixed on its own wheel and attached on the side of the bicycle.

This was apparently was a thing. It was used to motorize Japan at its industrialization debut.

On century later, electrification is now a thing and the same device is back with a battery. The loop is done.

PS: I do recommend the museum for anybody interested in industries and industrial processes.