When Vincent van Gogh moved to Paris in 1886, he was suddenly exposed to Impressionism's colors, which radically changed his palette.
So, to experiment cheaply with colour harmonies before trying on canvas, he used small balls of coloured wool.
He would arrange them in different combinations to see how hues interacted. The balls of wool were kept in this red cardboard box, which is preserved in the Van Gogh Museum in Amsterdam.
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