In the video, a man is standing on a stage holding a black triangle in his hands. He is wearing a white suit and is speaking to the audience. Behind him, there is a large screen displaying a blue triangle. The man is moving the black triangle in front of the screen, and as he does, the blue triangle on the screen changes its shape to match the black triangle he is holding. The man appears to be demonstrating some sort of optical illusion or magic trick. The stage is dimly lit, and the focus is on the man and the screen. The audience is not visible in the video.