Hi Thork,
That document is more of a conclusion, are there any links to his actual research?
He seems to have found a phenomena and then just gone around going "look at that, that confirms it".
Just curious if he tried different times of day, different light levels, different shapes, heights above the ground and colours. If he explained why it only happened to make an object proportionally shorter than it should be, essentially why a boats hull disappears but it's mast remains visible even though it's thinner than the hull.