Anyway, I'm sorry this got so far off topic.
Here's a question about Rowbotham's perspective laws:
Say you have a person standing up at a very far distance away on a perfectly flat plain. According to Rowbotham, there should be a distance at which the feet and lower legs of the person begin to disappear below the horizon. He attributes this to the small angular size of the person's legs. Their angular size is simply to small for the human eye to detect, so the lower legs simply disappear below the horizon. This explains the sinking ship effect. But I ask this, why should not the person's head disappear also? It's angular size is even smaller that the person's legs, yet our vision is still able to see it. Or why not the chest, arms or abdomen?