If you were to take a ruler and line all of the arches up, you will notice that they all meet at one specific point. This is whats known as the vanishing point.
This picture depicts the perspective of someone hat is looking at the bridge from the other side of a building.
Not only does this picture show the artists skills in proportions, but the oval at the bottom of the picture shows his skills of perspective. If one was to look at the oval from a specific angle, you can see a highly detailed skull.
Perspective doesn't have to be all about vanishing points though. The artist probably wanted to show the exact dimensions of the castle from on specific side.
This picture may not be perfectly symmetrical, but it does show how the vanishing point can be anywhere else besides the center.
The artist used perspective, and proportion to make a fully lifelike scene. It makes you feel as if you are there.
It may not be apparent, but the artist is using two point perspective. If you look closely at the center you can see the vanishing point separates into two section.
The vanishing point of an object doesn't stop at the shape of the building, if you look closely at the windows you can see they follow into the vanishing point also.
There is no visible vanishing point, but the artist does show perspective via the angle in which the picture is being viewed.
This picture includes high detail along with proportion and perspective. The vanishing point is far to the right, the walls of the room fit perfectly, and the window follows to the vanishing point along with it.
If you look closely at the snow and at the top of the mountain, you can see how they travel to the vanishing point.
This picture uses two point perspective to shape the room.
Trust me, this isn't a photo. This is an accurate illustration of what the inside of the Pantheon would look like if one was to be standing in the Pantheon.
The Drawbridge is an updated version of the arches we saw earlier, which still uses the same perspective techniques.
The room and the table are both products of the two point perspective. The first point is easy to see, but the second is off canvas. This creates an incredibly realistic room.
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