LIT There are 7×7 lines in each of 3 directions, 147 lines. Each holds 7 cells, so the lines visit 1029 cell-slots, which is 3×343.
AMBER Line here means a full row parallel to one axis.
WALL These are not sightlines through a room.
The grid holds 147 axis-parallel lines of length 7.
LIT There are 7×7 lines in each of 3 directions, 147 lines. Each holds 7 cells, so the lines visit 1029 cell-slots, which is 3×343.
AMBER Line here means a full row parallel to one axis.
WALL These are not sightlines through a room.