Oh, I get it. These are 8 sized (kaleidoscope) blocks. So she is able to piece the blocks across and the 6, 9 and 12 blocks work together like a puzzle. Now I have to figure out how to make the kaleidoscope block. Darn, I don't have enough for 8 repeats of what I have purchased.
ETA--what is she using to fill the spaces in the corners of each block?