Swarowski's sphere

This is a rainbow-coloured sphere. It is difficult to say what colour it is; from one side it is honey-yellow, from the other green, from the top it is bluish. And if you spin it the colours change.

The colours in the sphere (or in a similar structure resembling a pyramid) are not basic colours. For example there is no red. These colours are compounds (sums) of two basic colours. Such is the case with cyan; it is a mixture of blue and green.

This heavy glass ball cut in the shape of a football ball delights us with a range of colours depending on the angle from which we look. It looks like rainbow or even better.