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That puzzle-book chestnut (so autumnal!) “count the triangles within the triangle” has twice stared me in the face rather unexpectedly in the last couple of weeks: under my coffee on a table on a Grand Central train from King's Cross to York:
and on a poster (from Atomic Printworks) that now hangs above my desk…eyes up this time, not down.
Have you seen a maths puzzle where you least expected to?
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Page header by Kurt Bauschardt (adapted), some rights reserved