The two triumphal arches at the sides serve to emphasise the great space that the picture embraces and the effect is that of gazing through an open window in Perugia or at Montefalco.
There is no sense of crowding, the space is so vast that the populace of a country could not crowd it, and the air circulates in and around every group and serves to give the greater _plein-air_ charm.
There is a soothing quiet about the whole, a self-restraint and a stillness, and even though figure stands apart from figure and each one hardly notices the other, yet there is a fine thread of common interest to be seen connecting the whole of the foreground group and linking the spectators to the two central persons, Christ and the Foundation of His Church.
It is well when mentioning this great picture to state as a personal opinion that it is not possible to appreciate Perugino adequately, or even to understand him properly, without a visit to Umbria itself.
The country differs so much from other parts of Italy that mere comparison with parts better known is useless, but when once the student has sojourned in the country the charm of its landscape is felt and understood. There is a vastness about its open spaces, an immensity of view, boundless and yet enclosed, that must be seen to be understood.
To linger on the fortifications of Montefalco, to look out from the public square of Trevi, to wander along the road that divides San Girolamo from Spello, to drive along the plains of Foligno, to stay at Nervi, Deruta, or Bettona, to gaze out over the plains around Assisi, or to appreciate the wonderland that is mapped out around lofty Perugia--all these are so many lessons to the right understanding of Perugino. Away and away in the rolling distance are those vast plains, not flat surfaces, but a luxuriant country-side, irregularly marked by the contours of hills and valleys, dotted with tiny fortified towns crowning each its own hill and looking down upon its neighbour. Great white winding roads meander hither and thither, single trees stand out in sharp tall silhouette against the intense blue of the sky, and around as far as eye can reach stretch the half-hidden, half-revealed mountains clothed in a purple haze while the golden glare of sunlight bathes all the intervening space in its mystic light, tinging with gold the very grass of the fields, the grey drab of the roads, the ruddy brown of the buildings, and the radiance of the distant towers and houses.