Giovanni Tuccari, the painter who frescoed the church vault, was named “fulmine della pittura” (lightning-fast painter) for his speed. It took him very little time to paint such a large surface, because he used the same technique as some 18th-century artists who had similar requirements.
From a distance of less than twenty metres, the designs seem very elaborate, but they are in fact large brush strokes placed side by side in order to create optical effects; the colours are sometimes more blurred than others, where they end more abruptly.
A sort of impressionist technique used ahead of its time.