The key concepts for this project were as follows: 1) parameter and 2) user-controlled scenes. Parameter was essential to drawing a scene within a scene as I needed to control of scale of each scene. Through parameter, I was able to color the shapes and fill them with color. Another key concept, user-controlled features allow users to control some aspects of my shapes or scenes by using the sys package. I needed to incorporate this into my shape; what I ended up doing was allow users to choose the number of stars in my scenes.