i remember it also. it was a block with positive and negative curved parts, right? you cut it apart and then ....... ?
it involved fusible somehow. amma, are we thinking of the same one? who the heck was it?
i think what she did was start with 6 blocks, lets say 10". lets say 3 pink, 3 blue. on 1 pink and 1 blue she used iron on fusible, 2 sided. she stacked them and cut a shape. lets say, a drunkard's path. she took 1 corner pink piece and fused it to 1 blue. she took 1 large pink and fused it to 1 blue piece. she either did or didn't stitch around the raw edge. she did the same with the blues onto pink. she ended up with 4 finished blocks that looked like they had been pieced. after finishing they finished at 9.5".
amma, does that sound about right to you?