The kusudama flower is a modular origami flower made of several pieces of the same design. You may also see a kusudama ball that consists of several of the kusudama flowers to form a ball. Wikipedia describes the whole thing much better than I do. So, I'll leave it to them. Below is a visual of the steps to take to fold each segment, followed by the finale of putting together one flower.
To join them together, I used tape in the picture (folded so it's all sticky outside), double sticky tape would have been better but I didn't have any. I have also tried using glue but I found it difficult to hold together long enough for the glue to do it's trick. However, I found a work around to that. I use bobby pins to hold the papers together long enough for the glue to dry. This results in a sturdier hold and cleaner display, with the tape method, you can sometimes see tape peaking out.
Try making several of these and putting it together as a kusudama ball. I'd love to hear the outcomes. :-)