Psystem 1 by Matt Mello is the first release in the Psystem Series, where each psystem will feature a new propless method to divine thoughts.
Psystem 1 focuses on guessing a person's favorite color. They think of their favorite color and the performer begins to say random colored items for them to associate it with. Once the participant has a colored item in mind, they can stop you at some point after.
When they do, the performer is able to instantly divine their thought of color and the random item they're thinking of.
Psystem 1 can be adapted into any language.