Этот вопрос обсуждался здесь. Но поскольку люди спрашивают, я вынес его в отдельную тему.
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As for using "white" clay versus colored, it's because colors have psychological associations. They bring out emotions, like colored packages at the supermarket. The uncolored clay is emotionally neutral. You could also use gray as a second choice. But "hot" colors might be distracting.
