The main problem of children's sandboxes is theirpollution. Particularly successful in this are domesticated and stray cats, spoiling any available to them sand. To prevent children from playing in the midst of feline excrement, we propose to make a sandbox with a closing lid for them. After the game, simply close the lid and sand will be protected not only by cats and dogs, but also from other debris (leaves, packets, cigarette steers, etc.). And if the cover is knocked down yet and tight enough, it will protect it from the rain. Well, it's important to cover the whole construction with an antiseptic, otherwise it will quickly rot in the street. A closed sandbox is used firstFor private houses and villas. But in principle, it can be put in the public courtyard, if more or less adequate people live in your apartment building.