The first and most basic tenet of origami is creating shapes using a single piece of paper. However, when it comes to modular origami, which is complex and multi-sided, this rule becomes a little more lenient. It's actually rather common in modular origamit o see magic cubes or 36-sided stars being assembled from multiple pieces of paper.
Try your hand at modular origami by checking out this origami video. You'll learn how to fold a magic circle without glue.