I'm currently digging in perspective again as I feel like I don't appy these things really in my work, what I find the most hard to get is how vanishing points work and the horizon line and eye line, are the horizon line the same as the eye? the drawabox says that they most of the time line up. also can objects in the same drawing have a different horizon line or do they all follow the same one? is it possible for object to have different vanishing points then others or do they all follow the same one?