The three faces of the divinity
The concept of the time -thats Past, Present and Future- is, of course, an universal thematic and it has been considered in different ways and from many points of view, by different symbolic traditions.
Quoting a well-known istance, we can remind of the Roman Janus , god of the gates, that's of beginning and of end. In fact, his character symbolised the "moment " of the passage between what has already happened and what will happen.
It is known that the typical iconography of Janus shows him as the god with two heads, one head of an old man (the past) and the other of young men (the future).
This iconography was naturally inherited by the Christianity and, like a large part of the pagan heritage, re-elaborated and used in Christian terms.
We find a sample of this in a capital of Sansepolcro Cathedral
(Arezzo - Tuscany)- picture above - where we clearly see the "shaved" face of a young man on the right, while the bearded head of an old man is on the left. Between them, quite hidden in the foliage, there is a third character of smaller dimensions.
In this case, of course, the two faces on the two sides represent Jesus who was among the people giving them the Redemption (1) and Jesus who will be among the elects when at the End time He will come again glorious on the earth.
As for the central figure, hidden by the volutes, it represents the resurrected Christ who is in the Heaven where nothing is conditioned by the becoming of the terrestrial events.
So, we can consider this third character as living in the "eternal present", thats an absoluteness that is not allowed to the mortals and neither conceivable by them.
That's why the figure is hidden in the foliage.
An other example of this kind of iconography can be found (not by chance) in the "logo" of the index page of this website Index page
Finally we could add, that, for reasons connected with the specific conformation of the church, the position of this capital- second column from the entrance- probably identifies the beginning of the cosmological organisation of the general symbolism of the building.
(1) As far as this kind of iconography is concerned, René Guènon considers the bearded man "The Ancient of Days" (Psalms 69:14). ( "In the beginning was the Word... John 1,1 ) R. Guénon: - Simboli della Scienza Sacra p. 119- Adelphy Milano 1975
Iconografia medievale - Medieval iconography
I tre volti della divinità - Italian translation
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