Monumenta is a special exhibition in the nef of the Grand Palais under the 30 metre high glass roof. This year the invited artist is Buren and his creation is magic:

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The immense room is full of colours, shapes ans reflections. There are 5 different sizes (tailles) of coloured discs supported by black and white posts; when the sun shines the colours are beautiful.

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This is seen from above, from the staircase,

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In the centre there are some circular mirrors which bring the ceiling (plafond) down to the floor (plancher), the reflections are curious.