The exedra would typically have an apsidal podium that supported the stone bench. The northern side had a portico, while an exedra occupied the southern side. The interior exedra was richly exploited by Scottish neoclassical architect Robert Adam and his followers. The centre niche or exedra framing Oceanus has free-standing columns for maximal light and shade. The entrance to the palace is through the left exedra. The mosaic was used to decorate the exedra. The exedra achieved particular popularity in ancient Roman architecture during the Roman Empire. Four semi-circular steps lead to the exedra. The "exedra" was flanked by two large buildings, likely libraries. There are scenes shot in the conservatory, in the walled garden and by the exedra. After Percival receives the Darkus attribute energy from Exedra, Percival evolves to Knight Percival. The exedra probably housed a statue of Mercury. The exedra is tall, long, and wide. Each exedra has five windows, some of which are blind. Between 1598 and 1600 the exedra was converted into a church.