Léopold Szondi was a man who wanted to understand how people think and feel. He came up with a tool called the "Szondi Test" which is like a game where you pick which pictures you like the most.
Think of it like a big book with lots of pictures of different people's faces. You go through and pick the pictures of people that you like and the ones you don't like as much.
The pictures are of all different kinds of people - old, young, happy, sad, angry, and many other emotions.
What Léopold Szondi found was that the pictures you picked can tell a lot about who you are and how you feel. It's almost like these pictures can give hints about what kinds of things you might like or be good at.
So people use the Szondi Test to learn more about themselves and how they think. It's like a special tool that can help people understand themselves better.