Stack n Whack is a method of producing kaleidoscope disign blocks by layering fabrics on top of each other. You match the print of each layer securing it. The "layer cake" is then cut with a rotary cutter, triangles, squares etc. You get a stack of shapes to sew into blocks. This description is over simplified but you will get the gist of it. I like Stack n Whack 'cause it produces kaleidescope blocks without the "Swiss cheese" leftover fabric of the traditional method, voila not a lot of waste. Bethany Reynolds introduced this method and she has a few great books out there. I am still using her first one, Magic Stack n Whack Quilts.