1. Perspective is a technique artists use to create the illusion of depth and distance on a flat surface by making objects that are farther away appear smaller. 2. In one-point perspective, orthogonal lines converge at a single vanishing point on the horizon, making objects seem farther back as they approach this point. 3. Perspective creates optical illusions by tricking the eye into perceiving a two-dimensional image as three-dimensional, similarly to how we see in real life.