If I have a camera pointing "straight" down towards a table and put a pack of gum on the table, it will look the same no matter where I move the pack of gum in the image. If I put a bottle on the table right in the center of the image, I will only be able to see the cap and the top silhouette of the bottle. If I move the bottle towards the edge of the image, I will begin to see more of the bottle's side and the cap will at some point exit the image because the bottle will look skewed.
What do you call it when the height of an object determines how it will look in a 2D image, and are there formulas to calculate how much the object will get skewed(I am guessing the camera FOV has an impact)?
I realize this might be a math question, but if someone knows what it is called I think I can google it.