In Ayurveda there is ten pairs of  basic qualities called the gunas that are used to describe nature. These qualities affect our "doshas" or biological energies. One of the most simple and fundamental principal in ayurveda is that like increases like and opposites balance. Since everything in nature is described  through the gunas we can apply this principle to our lifestyle as well as our diet or emotional state.
The 10 pairs are:
Heavy / light
Slow or dull / sharp or penetrating
Cold / hot
Oily /dry
Smooth / rough
Dense / liquid
Soft / hard
Stable / mobile
Gross, big / subtle
Slimy, sticky / clear
Enjoy looking at everyday life, food etc with a different lens and play with the ever web of the balancing act of life!