A comrade here arose an idea, after a short look at the playground in the courtyard, and said: And I know what kind of sandbox children need, so that they do not scatter the sand in vain. The bottom of the sandbox is made of a powerful magnet, and instead of sand - a iron shredder!
No, did you think? They put sand in all their pockets. They are completely in the sand. And with this stitch soon there will be a bunch of children lying there and will not be able to get out!