Ok, thanks - so the "cut exactly the same way" is the key here. It's maybe not so obvious to non-puzzle aficionados? I thought it simply meant "all fit together

Ok, thanks - so the "cut exactly the same way" is the key here. It's maybe not so obvious to non-puzzle aficionados? I thought it simply meant "all fit together", the "same way" referring to the overall cut. Maybe clearer: "each puzzle piece the exact same shape"? Though it still suffers from the issue, as with a puzzle there's always the congruity of the final image as a hard guide as to what's meant to be correct, regardless of piece shape. That's maybe what muddles the analogy most.