Keep on going until you have the world record. My ball is about the size of a basketball because i've been working on it on and off for about a year
Step 2: Starting off
Take rubberbands and twist until small enough to fit onto the marble. Do this over and over until there is a ball big enough to pit the rubberband on without twisting it. keep keep putting rubberbands on (not in the same place. You want to put the rubberbands on to make a sphere shape) Do this until the ball is at a good size.