Origami Spiky Ball

spiky ball that can be opened and closed
This paper toy can be opened and closed (see pictures). I followed a tutorial on youtube.com (link is somewhere on this page..) It's not too difficult -- it just takes a long time.

UPDATE: I realized that there is another tutorial for this project on this website so the link to it is:
http://www.cutoutandkeep.net/projects/the_howto_reveling_flower
(Sorry that I didn't put this as a version.)