Here is a restoration of a DEC PDP-8 computer.
All the backplanes are wire wrapped. It can be a real rat's nest.
https://homepage.cs.uiowa.edu/~jones/pdp8/UI-8/log2013.shtml
And here is a closeup example I found online. Modified wrap.

F.Y.I.
There are two different wire wrap tools.
The "Standard" wrap just wraps the bare wire around the post.
The "Modified" wrap wraps one loop of the insulation around the post.
Wrapping the insulation around the post helps prevent shorts to an adjacent post or wire.
There are also different length posts. Typically, 2 and 3 layer posts.
The number of layers being the number of wires you can put on one post.