amusing footnote in Symmetric Functions and Hall Polynomials

In I.G. Macdonald’s Symmetric Functions and Hall Polynomials, on page 2 there is the following comment on the standard way to write down diagrams of partitions and tableaux:

Some authors (especially Francophones) prefer the convention of coordinate geometry (in which the first coordinate increases from left to right and the second coordinate from bottom to top) and define the diagram of \lambda to be the set of (i,j) \in \mathbf{Z}^2 such that 1 \le i \le \lambda_j. Readers who prefer this convention should read this book upside down in a mirror.

Oh, snap!

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