p5.js Half and Half Project

In Creative Programming, we used p5 web editor to visually program sketches using JavaScript. For my project, programmed lines ton move and only take up half the screen and i programmed an ellipse to move around the screen.  

Both the ellipse and the lines are redrawn each time the program is re-ran to simulate animation but the background is only drawn once. The ellipse is drawn only once and copied and repasted as it moves across the canvas, but the lines constantly over lap the the ellipse as it moves through them creating the illusion that its being redrawn every time it moves.