The Shroud has been studied by hundreds of scientists, including atheistic skeptics, many of whom have converted, and as of today, the image cannot be explained scientifically.
One characteristic of the Shroud that I find especially compelling (I work in 3D illustration/animation) is not only that it's a photographic negative (discovered in the 19th century), but that it's an embedded 3D terrain map. This property was discovered in the 1970s, when NASA scientists fed the image through a terrain analyzer.
That was one clever medieval forger.
I remember years ago seeing a pendant around the neck of our friendly neighbourhood grandma. It was a gold rectangle, about 2” x 1” and it had the face of Christ emboldened on it.
I told her that this was the first depiction of Jesus that I have ever seen that was believable, that actually struck me as being the real Jesus.
Grandma told me that the imprint was replicated from the shroud. That’s when, in my simple way, I decided it was authentic.
I have yet to see it explained why there is no space at the top of the head between the front of the body and the back of the body...