$sheet2   @$sheet2  (each of the @$row's)
          +---+
+---+     |   |     +-----+-----+-----+--
| *-----> | *-----> | ... | ... | ... | ...
+---+     |   |     +-----+-----+-----+--
          +---+
          |   |     +-----+-----+-----+--
          | *-----> | ... | ... | ... | ...
          |   |     +-----+-----+-----+--
          +---+
          | . |
            .