The picture shows an unfinished design for a tile floor. It needs more of the grey tiles. The two lines running through the picture are intended to be mirror lines: for each grey tile in the finished floor its mirror image across EACH of the two lines must also be grey. Begin your solution by putting in the mirror images of the tiles that are already grey. You may think that the whole floor will end up grey, but it won’t. You’ll see.
Solution
