In the book of Acts Paul states that he saw an impossibly bright light and heard the voice of Christ himself. The blindingly bright light is the Apex of this story; it is because of this that Michelangelo chose to situate this painting on the Western wall with the eastern exposure – so that the lunette situated above The Crucifixion of St. Peter would provide a bright light to illuminate it throughout the day.
In the book of Acts, Paul recounts an extraordinary experience in which he witnessed a resplendent light and heard the voice of Christ directly. This event is central to the narrative; as a result, Michelangelo chose to place the painting on the Western wall with its eastern exposure – ensuring that the lunette above The Crucifixion of St. Peter would provide a steady illumination throughout the day.