We can have different viewports connected to the same infinite canvas at the same time and visualise them.
Much of our lives, even at home, is spent in this virtual space, so why not share it with one another?
If I was sharing my home computer with my partner over remote viewports, I can pan over to the place at the canvas she was currently using as her viewport and get a visual connection with what she was doing and interact a bit.
Of course you could have a "redacted session" in which case the area used as viewport would be blacked out, if you need secrecy for e.g. work.
I really enjoy the concept of sharing one computer and at the same time, like virtual space in addition to apartment space. This is, pretty much, a user interface extension of finger[1].
You can use space to have a visual organisation of things, but you don't have to navigate the space since it's virtual. You should be able to navigate suitable to your platform running the viewport.
Pinch-to-zoom, drag to move, two-finger tap to bring up list of applications to move to instantly on a tablet.
Keyboard based navigation and manipulation of the canvas if you prefer to not use a mouse on your workstation.
Click to drag and scroll-to-zoom to navigate with a mouse, when that is more appropriate, for example.
If an argument from authority means anything, Jef Raskin, one of the creators of the Archy system mentioned, is a large part of the reason modal UIs are Considered Harmful. If he thought ZUIs were an answer, well, you might have something mixed up.
