When we look at an object that is close our brain scales down so that it looks normal sized and when an object is further away we scale it up so it looks normal rather than tiny. This reminds us that the size of the object remains constant but helps us to make sense of our world.
We perceive bigger objects as being closer than smaller objects (which we perceive as further away) by using the depth cue of relative size.
We use the depth cue of texture gradient when looking at cobblestones or a sandy beach we see that close up the surface is very detailed while further away the texute is less clear.
When we look at pictures…