What (who) is take sights - definition

The four sights are four events described in the legendary account of Gautama Buddha's life which led to his realization of the impermanence and the ultimate dissatisfaction of conditioned existence. According to this legend, before these encounters Gautama Siddhartha had been confined to his palace by his father, who feared that he would become an ascetic if he came into contact with sufferings of life according to a prediction. However, his first venture out of the palace affected him deeply and made him realize the sufferings of all, and compelled him to begin his spiritual journey as a wandering ascetic, which eventually led to his enlightenment. The spiritual feeling of urgency experienced by Siddhārtha Gautama is referred to as saṃvega.