The image on the shroud is much like a photographic positive. Half of the shroud has the back of Jesus and the other half has the front of Jesus. Careful examination of the material shows no partial image of the front on the back and no partial image of the back on the front. If the energy source were from front or back there would be evidence of both perspectives in both surfaces of the cloth, but none is there! The source of the energy had to come from inside and radiate outward in all directions, leaving the images of front and back on the two surfaces without impinging upon either, as in a double exposure, etc.
Jews demand signs and Greeks look for wisdom, but we preach Christ crucified: a stumbling block to Jews and foolishness to Gentiles,
but to those whom God has called, both Jews and Greeks, Christ the power of God and the wisdom of God.
For the foolishness of God is wiser than human wisdom, and the weakness of God is stronger than human strength.