最后你可以进一步用两种或者三种颜色，或者是用暖色或者冷色调色板，而且你的作品扩展到包括人物和风景。
Eventually you move up to two and three colors, then maybe a warm or cool palette, and your subjects might expand to include figures or landscapes.
无论你用什么颜色来搭配这三种颜色，或者你怎样来混搭这三种颜色，你都会感到很自在的。
Anything goes with these colors, and you should feel free to mix 'em however you want.
用红、蓝和绿三种颜色给有15个方位的转盘着色，有多少种方式？
How many different ways can we color a roulette wheel of 15 locations with the three colors red, blue, and green?
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