For the orange square, if you click on it, it will shrink. If you press the down arrow, it will change color, and if you press the up arrow, it will fade away, you can press space to make the orange square go back to normal. For the purple Circle, if you press the left arrow it will grow, if you press the right arrow, it will disappear, and if you click on it, it will brighten up, you can press space to make the purple Circle go back to normal.
