Replacing the firebricks in the wood stove would have been a much less of a mystery had the replacements come in the proper size or with some sort of helpful hints.

This is my “mystery” picture for photo10 but I’d like it to be clear that I actually found these bricks to be confounding, dirty bastards rather than interesting and mysterious items.
Receiving nothing but a cryptic “map”, with what were eventually determined to be incorrectly sized bricks, the project turned into an entire evening full of…. entertainment.