1. Feature 1: cube creator
    1. input: click on the screen
    2. output: cube is made anywhere in the screen that you clicked
  2. Feature 2: Display Mouse position
    1. input: Mouse location
    2. output: Text of mouse coordinates is displayed on the screen
  3. Feature 3: change the color of the cube
    1. input: click the drop box and change the color
    2. output: click anywhere and the cube that appears will change color to the selected color in the drop box
  4. Feature 4: change color of background
    1. input: select the slider and drag it back and forth
    2. output: the color of the background is changed to different degrees of red