Linear Perspective is a depth cue that is related to both relative size and the next depth cue, texture gradient. In linear perspective parallel lines that recede into the distance appear to get closer together or converge.
‘The School of Athens’ by Raphael (1518), is an example of Renaissance work of linear perspective and the creation of illusion of depth.
Perugino – ‘Christ Delivering the Keys of the Kingdom to Saint Peter’ Sistine Chapel fresco 14oos. Linear Perspective.