Flowers and Yin Yang

A trip to Birkheads Secret Garden which was looking really lovely.  Hidden away I noticed the stone Yin Yang sign.

Yin Yang comes from ancient Chinese philosophy.  The principle of Yin and Yang is that all things exist as inseparable and contradictory opposites, for example, female-male, dark-light and old-young.  The pairs of equal opposites attract and complement each other.  I'm not sure I fully understand it but it's interesting.