Oh yeah.

A year later, the PowerBook Duo was born. Extremely thin and lightweight for its time, the Duo was arguably one of the first true sub-notebooks for the masses. It packed a bare minimum of features, otherwise relying on a docking station for extra video memory, storage space, connectors, and connectivity to external displays.
(Apple Insider)

I had one of these. This was back in the days when desktop computers lay horizontally rather than standing vertically like they do today, and the "docking station" was at least as big as desktop box - a little bit larger, even. The laptop slid into the docking station pretty much the same way a floppy disk slides in. There was a small hard drive in the laptop and a much larger one in the dock. So in effect it was a laptop that acted like a desktop on your desk. A pretty nifty solution - no cables to unplug every time you wanted to take the laptop along, battery always charged, no problem syncing files.

It still sounds pretty good.