During the Middle Ages, the technique of perspective was not widely used in art because it was considered to be a form of illusionism and realism. This approach was seen as being inappropriate for religious art, which was the dominant form of art during this period. Religious art was intended to depict sacred subjects in a spiritual and symbolic manner, rather than to create a realistic representation of the world.

The use of perspective in art was also associated with secular subjects and themes, such as portraiture and landscape painting, which were not as highly regarded as religious art during the Middle Ages. Additionally, the lack of understanding of the laws of perspective made it difficult for artists to accurately depict depth and space in their works.

As a result, the technique of perspective was not considered beautiful or desirable in art during the Middle Ages. Instead, artists relied on other techniques, such as flat, two-dimensional compositions, symbolic representations, and the use of gold leaf and other decorative elements, to create works of art that were in keeping with the religious and artistic ideals of the time.

However, it's important to note that the technique of perspective was not completely absent during the Middle Ages. Some artists, such as Giotto and Duccio, began to experiment with perspective and other realistic elements in their works, laying the foundation for the widespread use of perspective in Renaissance art.