Rnd 2: Join with sc in any corner, ch 3, sc in same corner, (ch 2, sc in next ch-1 sp) across to next corner, (sc, ch 3, sc) in corner; repeat from * around ending last repeat at first corner, join with sl st in first sc. Fasten off.
Rnd 3: Repeat rnd 1.
Rnd 4: Repeat rnd 2.
Rnd 5: Join with sc in second ch-sp before any corner, * (dc, ch 1, dc, ch 1, dc) in ch-sp before corner--shell made, shell in corner, shell in ch-sp after corner, (sc in next ch-sp, shell in next sp) across to corner, skipping one ch-sp if needed to make sure shell falls in ch-sp before corner; repeat from * around ending at first sc, join with sl st in first sc. Fasten off.
Next stop--complete afghan photos! :) :)