I am confused about the constructive triangles. I have seen this sold as one box of blue triangles, a set of three boxes, and a set of five boxes. Which one do I need? Also, is this a material I should be making myself?
I am also confused about the square of Pythagoras. I'm not sure I've seen what Gettman describes being sold in my usual haunts. I have seen a "Pythagoras board" that comes with a set of 100 white, numbered tiles. Gettman describes the Pythagoras square as a box with ten compartments, each holding a set of plastic tiles of a particular color. Has anyone seen any examples? Again, should I be making this material myself?
I find it a bit odd that I haven't seen this materials in use on any of the 140+ blogs in my reader. Are these materials part of the standard sequence?