It was the great achievement of the Byzantine architects Isidorus and Anthemius , to transfer the weight of the dome to the pillars using arches and pendentives , the four triangular sections of masonry that fill the gaps between arches and dome , to create the illusion of an unsupported dome floating in space .
The architecture style Isidorus and Anthemius favored makes it very clear that the dome is supported by arches and other structures .