Why does a direct print reverse its design?

Lettering on a stamp's printing face can look backward even though its impression reads normally. The reason lies in direct transfer between two surfaces. An inked face meets the paper face to face, and the paper receives marks where the ink touches it.

Afterward, the printing face and the printed side of the paper are viewed separately. If both are held upright with the same top direction, their left and right relationships are reversed. What was on one side of the viewed face appears on the other side of the viewed impression. The ink has not had to slide sideways across the page; the change follows from how the two touching faces are viewed.

The asymmetric F outline makes that relationship clear. A usual-reading F on the printing face produces a reversed F on the paper. A reversed F on the face produces a usual-reading F in the impression. The unequal L outline reveals the same relationship. A more symmetric design might hide the reversal because its two sides look alike.

This comparison keeps the top at the top, so it is not a turn that puts the letter upside down or a change in size. Direct printing links contact geometry with a familiar result: the design on the face must account for the reversed view of its impression.