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Blue is a very sensual, indulgent colour, one that Klein used well. Some people say it's unfair of artists to use it because it's so eye-catching, too easy. The above, I believe, was not intended primarily as art, just plain bog-standard tiling in a public toilet, but they still went the extra inch by putting black filler in the gaps. White, cheaper, would have looked horrid. Someone deserves praise.
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