The purpose of the vision ball markings is to encourage participants to watch the ball all the way into their hands. A coach or parent then asks what colour they last saw or which shape they saw when they caught the ball. Used together with the Crazy Catch it provides the facilities for young ones to learn and obtain the basics motor skills that will assist them with their sporting life in years to come. Vision Ball 2 provides an erratic rebound on the “insane” side of the Crazy Catch. and a predictable rebound off the sane side. 72mm (cricket ball) diameter - Hollow centre.