The chapel has four triangular pendentives in each of it's corners. These curved shapes have been decorated with stories depicting the salvation of the Jewish people.
The four are:-
The Brazen Serpent.
The Israelites became unhappy at the hardships endured on their journey to the promised land and brought upon themselves the wrath of God. God in his anger sent a plague of serpents against them. When they repented their behaviour he told Moses to make a bronze serpent and anyone who had been bitten by the reptiles would be saved by looking at the bronze statue.