Windows are arranged in columns on an infinite strip going to the right.
Opening a new window never causes existing windows to resize.

Every monitor has its own separate window strip.
Windows can never "overflow" onto an adjacent monitor.

Since windows go left-to-right horizontally, workspaces are arranged vertically.
Every monitor has an independent set of workspaces, and there's always one empty workspace present all the way down.

All these scrolling WM:s sound so fun! I want to try one one day.