[HeyImAlex]

It's made to look like a physical letter.

[mitjak]

Except nobody writes in grey ink on low-grade grey paper.

[tripzilch]

You forgot about dot-matrix printers in "draft" mode.

[dredmorbius]

... on 75% post-consumer recycled paper.

[tripzilch]

I was thinking about the old continuous tractor-feed paper, some kinds are really thin, almost slightly translucent, for that extra subtle low-contrast retro design! ;-)