Why was the technique of perspective used during the middle ages?

(For apex)

The goal of art was to spread a religious message, not to create mathematically correct canvases.

The appeal of linear perspective to medieval artists was partly that it made their art appear more realistic, an partly that it made their art appear more like art of Roman antiquity.

There are different types of perspective drawing. Linear perspective, which is the type commonly used today, was developed during ancient times and lost in the beginning of the Middle Ages. Starting in the last years of the High Middle Ages, artists began to investigate this technique once more, as they could see it in ancient works of art. Giotto di Bondone, who lived from about 1267 to 1337, was one of the early investigators of perspective.

The other types of perspective include reverse perspective, which can be seen in medieval icons and makes objects appear bigger as they are farther away, reversing the convergence of lines. Another type of perspective mererly makes more important things or people bigger, and this can also be seen in medieval art, where Jesus is larger than saints, who are larger than kings, and so on. Atmospheric perspective, which makes farther objects grayer, as though obscured by mist, was used in China, but I have not seen it in European art.