The sensation of space is created by the absence of supporting walls beneath the dome; it rests instead upon four great arches, which in turn spring from four massive piers.
The arches that support the dome are thirty feet tall.
mnli hypothesis: The arches that support the dome are thirty feet tall. premise: The sensation of space is created by the absence of supporting walls beneath the dome; it rests instead upon four great arches, which in turn spring from four massive piers.