| 摘要 |
An array of shapes comprises first shapes which are shaped to be right-angled isosceles triangles ("unit triangles"), second shapes which are squares made up of two unit triangles, third shapes which are lozenges made up from two unit triangles, fourth shapes which are triangles made up from two unit triangles and fifth shapes which are triangles made up from four unit triangles. A set of 24 such shapes are each coloured with a respective colour derived from a specified colour wheel. Extra shapes can be provided to make exact rectangular forms.
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