What unkique approach did Leonardo do to make the Last Supper? Why do you think he did this?

i read this before

Explanation: Leonardo da Vincis Last Supper is a Renaissance masterpiece, though it is one which has struggled to survive intact over the centuries. It was commissioned by Duke Ludovico Sforza for the refectory of the monastery of Santa Maria delle Grazie in Milan, and in order to paint it Leonardo used an oil/tempera mix and applied it to a dry wall. He did this because he wanted to capture the look of an oil painting.

this is a experment where you actully have to do the work like go take some photos in something your interstid in