I have nothing better to do than to write reviews about bath tubs and bath toys at 3 in the morning because I truely do sweat out the details and research in this beloved and sometimes feared chore.My newest favorite bath toy is this. You submerge it in water, and it fills up perfectly. The size of the single hole on top of the cloud is perfect, and molded with pure smoothness. This is not a cheap watergun party favor from your kids' friends birthday. Those do not fill up well and you have to try all sorts of angles to see proper air bubbling. All angles work, but the best is simple no angle submerged. Same uniform size air bubbles pop up like a dance.Next, you cover the hole with one finger and wrap your otherr fingers around. You life it up, higher than your toddler's head, and then you hold your breath, releasing the finger on top.Downpour!Okay, more a steady sprinkle, but delightful and quickly the storm is over and you need to refill.To cleam or aerate: Squeeze on the sides of the cloud and a gap will appear at the centerline. Stick one fingernail from another hand in whilst squeezing in one hand, and pry it open. Voila. Lay open on a hand towel on a countertop. Dries completely in minutes. Is this patented? All bath toys need this mechanism. You'll see what I mean when you open it. No mold problems.Object is a thing of beauty snapped back together and displayed on my bathroom counter. My only wish for improvement? A way for it to click side by side to other clouds for a real stormy experience. Like those atom molecules toys you see chemistry students play with...