Duality means dual reality.
In every duality, vibrations of energy are divided & in opposition.
They are divided by frequency & wavelength.
Frequencies of a vibration are divided by positive or negative polarity.
Wavelengths of a vibration are divided by male or female gender.
Male & female gender may be polarised as being either positive or negative.
Duality allows choice.
Without duality there is no choice.
Without choice every vibration of energy is Oneness, Singularity & Sameness.
The duality of space & time allows choice to be experienced as a reality.
The duality of polarity & gender allows an experience of reality to have an intensity.
A really intense experience is called a drama.
Drama can only exist in a dual reality world.