The Kaleidoscope block is an all time favorite; it is made of two different triangles that can be cut from strips using a Kaleido-Ruler. All the measurements (block and strip sizes) are printed on the ruler, no guess work. Just pick a block size, cut your strips and sub-cut into triangles; you are now ready to sew! Complete instructions included. See Marti's book Kaleidoscope ABCs (#MM 8049) for more tips and inspiration.