Final answer:
The technique demonstrated in the fresco seen above is perspective.
Step-by-step explanation:
The technique of Leonardo da Vinci demonstrated in the fresco seen above is perspective. Linear perspective is a method of creating the illusion of three-dimensional space on a two-dimensional surface using receding parallel lines. This technique was popularized in the 15th century during the Renaissance, and artists like Leonardo da Vinci and Filippo Brunelleschi utilized it in their works. With perspective, artists were able to create more realistic and lifelike representations of space and depth in their paintings.