Two white coin envelopes are required measuring 2 7/8" wide x 5 1/4" deep. Also, one larger white, end-opening envelope that will hold the smaller one. Begin by trimming 1/8" off the bottom of one of the smaller envelopes. Now trim off a 1/8" sliver from each of the long sides of the same envelope. Coat the seamed, short panel with rubber cement and insert it inside the unprepared envelope. Line up the upper edges and allow to dry. The double thickness will make the seam side of the envelope opaque.
On the remaining unseamed, flap panel place a light pencil dot on the centerline of the panel, exactly 1 1/4" up from the bottom edge. This will be the location of a centered, 1/2" square cut-out window (see illustration). Lightly draw the window and cut it out using an X-acto knife. Now, insert this flap side of the envelope into the unprepared envelope and line-up the top edges of the two flaps. Glue the two flaps together with rubber cement or if you're in a hurry, simply wet the glue on the outside flap and fasten it to the back of the inside flap. If you hold the envelope up to a strong light, you'll see the outline of a 1/2" square window visible in inner lining of the envelope. In other words, every square inch of the envelope is now opaque on both sides, with the exception of the window which is covered by only one thickness of paper.
Obtain five E.S.P. design cards consisting of the circle, plus sign, wavy lines, square and star. You'll note that a small portion of each design is visible through the cutout secret window when the card is placed inside the envelope (flush with the bottom) with the design side facing the unseamed side of the envelope. A curved line showing through the window will signal the circle. A straight vertical line identifies the plus sign. Three vertical lines obviously indicate the wavy lines. A straight horizontal line identifies the square and depending on which end of the star card was inserted, a "V" shape identifies the star. No matter which design card is inserted into the envelope, you'll be able to immediately identify it through the small 1/2" square window which is covered with a single thickness of paper.
If you hold the envelope with the unseamed side up, you can see the faint outline of the window. However, if you rotate the envelope over and over, quickly showing each side, it's impossible to see the secret opening. In fact, if you can obtain blank backed E.S.P. design cards ("Magic Christian" brand by Piatnik) or simply glue blank face cards to the back of your Fox Lake brand E.S.P. cards, it helps disguise the hidden window even more so when the blank backs are against the window side of the envelope when the envelope is initially shown. You can also show the envelope by holding it by the top edge and quickly turning it over once or twice to show both sides. Actually, all you're trying to do is dispel the idea of any slits or cut outs in the envelope. So don't overdue it. Remember the old adage, if no one is chasing you—don't run.
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