(this also makes a neat bar trick with a cocktail napkin)

Supplies:
 
• One piece of cardstock 5 ¼” x 10 ½”
• Scoring tool
• Pencil
• Ruler
• Scissors


Step-by-Step

Step 1
Start with a piece of cardstock 5 ¼” x 10 ½”.
Fold paper in half, patterned sides together to make a 5 ¼” square.


Step 2
Open the paper and with the patterned side up, fold the right side back to the center, creating a quarter fold on the right end.


Step 3
Open the paper again, but with the patterned side down.
Grab the lower left hand corner, pull it up and over until the lower edge is even with the score created in Step 2. Crease.

Step 4
Open the paper again, still patterned side down.
Grab the top left hand corner, pull it down and over until the upper edge is even with the score created in Step 2. Crease.

Step 5
Open the paper, patterned side down to see the score lines.
Mark the center of the left hand edge and draw a line from that point to the score marks a quareter of the way to the right, top and bottom.

Step 6
Cut along the pencil lines to create a point at the top of the card.

If everything was creased in the correct direction, it should fold up perfectly. Add a little bit of adhesive under the front point on the bottom to get it to stay upright.

Step 7
The finished card folds flat and is 5 1/4 ” square. When taken out of the envelope, it will “spring” up, thus the name.  For mailing, use a 5 1/2 square envelope.

and a side view: