I think the idea is kind of silly. It’s not that I think Christ could not alter the appearance of His human body if He chooses. He is God and can obviously do whatever He wills.
But His body is a definite and particular human body. It possesses a unique DNA encoding. Thus, there must exist a single and unique appearance. Whether He chooses to disguise Himself is another matter. He can do whatever He wills. So if He wishes to take a different appearance, then that’s what He will do.
Yet He does possess a very distinct and singular natural appearance. It strikes me as diminishing of our humanity to state that Christ would walk around like a human chameleon.
You have to remember that in the early centuries, there were two major centers of biblical exegesis and theology: that of Antioch and that of Alexandria. The school of Alexandria is particularly known for its allegorical interpretation of the Scriptures, while the Antiochene school had a more literal and occasionally typological exegesis.
Concerning the matter of christology, the Alexandrian school had traditionally approached the question from the divine angle (on how God could become a human being), while the Antiochian school focused on the human angle (on how the man Jesus could be divine). Consequently, the Alexandrians tended toward a christology that emphasized the
union of the human and the divine in Jesus, while the Antiochenes emphasized the
distinction between the human and the divine natures of Christ. In fact, taken to the extreme, these different emphases gave birth to two of the major heresies of the early Church. From Antioch came Nestorianism (i.e. Christ had two loosely-united natures), while Monophysitism (i.e. Christ had only one nature, His divinity ‘consuming’ His humanity) - which emerged in reaction to Nestorianism - had its origins from Alexandria.
Gnostic or orthodox, those who held the idea that different people perceive Jesus differently according to their level of understanding usually did so in order to emphasize the divinity of Jesus - although from our point of view it does seem to come dangerously close to emphasizing His divinity at the expense of His humanity.
Here are a couple more ‘orthodox’ sources which also express the same idea. First is the apocryphal
Acts of Peter (late 2nd century):
And Peter went into the dining-room and saw that the gospel was being read. So he rolled up (the book) and said, ‘You men who believe and hope in Christ, you must know how the holy scriptures of our Lord should be declared. What we have written by his grace, so far as we were able, although it seems weak to you as yet, yet (we have written) according to our powers, so far as it is endurable to be implanted in human flesh. We should therefore first learn to know the will of God, or (his) goodness; for when error was in full flood and many thousands of men were plunging to destruction, the Lord in his mercy was moved to show himself in another shape and to be seen in the form of a man, on whom neither the Jews nor we were worthy to be enlightened.
For each one of us saw (him) as he was able, as he had power to see.
‘And now will I explain to you what has just been read to you. Our Lord, wished me to see his majesty in the holy mountain; but when I with the sons of Zebedee saw the brilliance of his light, I fell as one dead, and closed my eyes and heard his voice, such as I cannot describe, and thought that I had been blinded by his radiance. And recovering my breath a little I said to myself, “Perhaps my Lord willed to bring me here to deprieve me of my sight.” And I said, “If this be you will, Lord, I do not gainsay it.” And he gave me his hand and lifted me up. And when I stood up I saw him in such a form as I was able to take in.
‘So, my dearest brethren, as God as merciful, he has borne our weaknesses and carried our sins, as the prophet says, “He beareth our sins and is afflicted for us; yet we thought him to be afflicted and stricken with wounds.” For “he is in the Father and the Father in him”; he also is himself the fullness of all majesty, who has shown us all his goodness.
He ate and drank for our sakes, though himself without hunger or thirst; he bore and suffered reproaches for our sakes; he died and rose again because of us. He who defended me also when I sinned and strengthened me with his greatness, will also comfort you that you may love him, this (God) who is both great and little, beautiful and ugly, young and old, appearing in time and yet in eternity wholly invisible; whom no human hand has grasped, yet is held by his servants, whom no flesh has seen, yet now he is seen; who no hearing has found yet now he is known as the word that is heard; whom no suffering can reach, yet now is (chastened) as we are; who was never chastened, yet now is chastened; who is before the world, yet now is comprehended in time; the beginning greater than all princedom, yet now delivered to the princes; beauteous, yet appearing among us as poor and ugly, yet foreseeing; this Jesus you have, brethren, the door, the light, the way, the bread, the water, the life, the resurrection, the refreshment, the pearl, the treasure, the seed, the abundance, the mustard-seed, the vine, the plough, the grace, the faith, the word: He is all things, and there is no other greater than he. To him be praise for ever and ever. Amen.’
Note that the
Acts of Peter is at pains to emphasize that Jesus’ physical body is real (and hence, does not express docetism), and that Jesus really suffered and died for our sakes. Again, as in Origen’s idea, here each of the disciples perceive Jesus “as he was able, as he had power to see.”