East Coast Nursery Say Hello Discovery Ball. SEE WHO'S HIDING INSIDE East Coast Nursery have proudly teamed up with Baby Sensory to create a range of toys designed around the "Say Hello" theme tune and the seven characters it introduces. The Baby Sensory Say Hello Discovery Ball is the perfect size for little hands to hold and fun to try and crawl after. The discovery ball features bright and colourful characters both inside and out. With fun textures for your little one to discover and a jingling bell that chimes as baby shakes or rolls the ball there is plenty to keep young babies stimulated and entertained.