
The 81 first digits of 'pi' displayed as sets of concentric circles (bird's-eye view) [Les 81 premiers chiffres de 'pi' visualisés comme ensemble de cercles concentriques (vue aérienne)].
5----1----4
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| | .
9 3----1 .
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2----6----5----3
and then displayed using sets of miscellaneous concentric colored curves (N ones for the digit 'N').