Attach the cup holder to the side of the tub, stack the interchangeable cups inside it.

Show your child how to fill up one cup with water and pour over the other cups, setting different water effects into motion, like spouting, spraying, and straining.

Encourage your child to switch out the cups and try different configurations to enjoy the sensation of the various effects, including the peek-a-boo cup that floats up, too.

Stack the cups in the cup holder after playing, for storage until next time.