This is a cool project & it certainly gets a lot of ohhh - there seems to be a lot of different versions on the web but this is my compilation of them all and is what my upline Jacque taught me - reading them all, this is supposed to be the "easiest way".
You need 4 pieces of 6x3" card stock, which you score at 1-½" & 4-½" vertically & also at 1-½" horizontally. Loosen the score lines gently.
Butt 2 pieces of the card stock with the central score line lying horizontally - it should look like a 6x6" square. Add lots & lots of adhesive to the 4 corners. Then overlay on top exactly the other 2 pieces of card stock with their middle score lines lying in a different orientation. I hope the diagram below is explanatory.
To me the trick to make the never ending card move/never end is to fold back the behind piece - it should look like a H.
I've then decorated as below. Confused come to a class at my house in August (date & time to be announced) & see how easy it really is.
This is the front of the card:
This is the first opening:
This is the 2nd opening:
And the "backside":
Stamp set: Cheep Talk
Paper: Pacific Point, Whisper White, Good Morning Sunshine DSP
Ink: Kiwi Kiss
Stampin' Markers: Taken With Teal, Pumpkin Pie, Chocolate Chip