The idea is to have spaces that children can go to when they want to play alone. There can still be activities in the room for mixing such as blocks, dolls, some of the larger fisherprice type sets.

The rule then becomes when a child is in a hoop you are not allowed to bother them. Also make it clear which shelf they may choose "hoop" toys from. Ie it can't become a place a child takes a favourite group toy and then sits and hogs it just so no one else can play with it.