Envelope with instructions how to make an envelope. I did in fact make most of my envelopes as described on this envelope (which itself was made according to the directions):
(1) Start with an 8-1/2 by 11 inch sheet of paper (standard paper size).
(2) Draw lines on sheet to indicate where folds should be made (M1 thru M8, near the corners of the page).
(3) Make four folds, to create the four flaps which will comprise the back side of the envelope (note that documentary information about the envelope: title, create date and location... appears upside down on the sheet of paper being processed, so that, when folded over, it will be right side up on the back of the envelope.
(4) Cut off the four corners of the sheet (quadrilateral areas including marks M1-M8).
(5) Glue bottom flap to side flaps, with Elmer's Glue-All.
(6) Insert letter in envelope.
(7) Glue top flap to bottom flap, to seal envelope.
(8) Mail it.

[More Mail art on main page: here.]