Art
he used oil paint on wood panel for the mona Lisa
Leonardo da vinci used oil paints
Value, was the element that Leonardo Da Vinci used the most out of all the other elements.
My balls itch
for the Mona Lisa he used "oil plants". This was first used in the Late Middle Ages, and then adopted by cultures all over the world.
engineering
He did not draw paintings, he painted them.
sfumato
Yes, he used a mirror.
most of his inventions are used every day
He used mirror writing.
He invented it but it could not be used.