Prathyahara, the threshold of Hatha and Raja Yoga

There are eight accessories in the practice of yoga. Among these eight accessories, the first four yama, niyama, asana and pranayama engage the mind in the external world, practising Hatha Yoga.

There is aesthetic beauty and taste in all the subjects and objects. When the senses are controlled keeping them away from the mundane world and to its experience and taste, the senses respond to this aesthetic nature and quality of the subjects and the objects.