This cool, airy building concertinas across a hillside outside of Aix; the black and white facade hints at the kaleidoscope of delight within. The museum houses towering panels of brightly coloured optical art: are those cubes really flat? It seems impossible that they aren't pouring out of the walls. Our children were captivated and we were too. For a couple of hours we escaped the heat and revelled in colour and shape and illusion. We felt truly enlivened and enriched when we launched out into the sun's glare once more.
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