Foldable.

Same colors are the same sheet of paper.
I think you added an extra tab in there, or something, but I don't know. So you fold one piece, closer to the top than the others, and then fold another closer to the middle, and then another even closer to the middle. Then you stick them into each other with the folds all in the same spot, so that the one with the fold closest to the top of the paper is on the outside, and the one closest to the middle is in the middle of them all. Then you staple on the fold.
I think I explained that well enough..... If I didn't just, ask me again I guess.