Ball To Dice (Yellow/Black) by Mr. Magic

Ball To Dice (Yellow/Black) by Mr. Magic 

The magician shows two sponge balls, one yellow and one black -- one in each hand. The black ball is placed over the yellow ball into one closed hand. He waves his other hand over the balls. When the closed hand is opened, it is seen that both balls have now melded into a solid yellow die with black spots!