Linda, I checked on google and found www.connectingthreads.com had a great tutorial on the making of Stack and Whack pieces. She explains it very well and the tutorial lasts 8 minutes so she is not rushing you.
http:/www.connectingthreads.com/tutorial
Try it. Lots of fun things to make this way, and can be made with 4, 6, or 8 pieces and each one is different, just like a kaleidoscope.
Carol J.