... balls are used out of the sun or at night.c.) just change the air inside the ball ... in no time!6), NIGHTIME WATER FUN INSIDE THE "LOVEBALL"We use a long safety rope, at night, thus allowing ... in privacy. Lots of couples have enjoyed a romantic "night time" floating experience.7),"GLASS BOTTOM WATERBALL"What's the ... of the water and even use a flashlight at night to attract them to swim up under the balls ...