I agree with Playfelt.

I have 'carpet squares' and 'hula hoops' to define space for children ... if a child is not playing sociably they go to the carpet square and have to play alone within that area so it is not a 'time out' but rather a 'time in' they can still engage in PLAY but they are done playing with others for a bit ... good visual for other kids do not bother someone when they are on a carpet square cause they need some alone time I have children who choose a 'time in' so to speak on their own they just need that break from being 'social' but still want to be able to play!