The chair is also a metaphor. Planning a project in a hammock is as much work as typing on Emacs.

But googling productivity advice, asking people what should they work on, and faffing about on HN is NOT work. Jumping on another project instead of taking one to completion as soon as it starts to get unfun is NOT work (which is OK for a hobby, but work gets harder the closer you are to completion)

In any case, you can do a lot of work away from the keyboard, but until you type it in in your editor, it's just an idea that exists in your head, and those are worthless.