void updateImage()
    {
        //Create an image of the set size using built in greenfoot commands
        GreenfootImage displayImage=new GreenfootImage(size,size);

        //Draw Circle
        displayImage.setColor(ballColor); //Set color to ballColor
        displayImage.drawOval(0, 0, this.getSize(), this.getSize()); //Is the problem here?

        //Display the number inside circle
        Font displayFont = new Font( (int)(size*0.75) );
        displayImage.setColor(ballColor.BLACK) //Set color to Black
        displayImage.setFont(displayFont);
        displayImage.drawString(Integer.toString(size),(int)(size*0.1),(int)(size*0.8));
        //Add the image as the new image for this object
        super.setImage(displayImage);

    }