OP. decorative T&G boards are machined with a chamfer at both sides on the outre face (the upper face on the photo you posted), That face goes outermost.
Both have typefaces named after them (Aldus by Hermann Zapf and Arrighi by Frederic Warde respectively). PageMaker DTP software was originally by software house Aldus, also named for Aldus Manutius
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