opportunties to play outside. let's get more from our correspondent phil mercer. what is the problem in australia about housing density they are talking about? thea;r they are talking about? they say informal _ they are talking about? they say informal outdoor - they are talking about? they say informal outdoor play i they are talking about? iia: say informal outdoor play by children has been in decline in australia for quite some time and they point to many reasons, parents, child safety, increased traffic, pull city planning. also greater housing density. medium to high density housing, apartment blocks are a relatively new concept in sydney. but anyone who has been to australia's biggest city in recent times, not that you have been able to get it because of covid restrictions, but you would notice the city is getting taller. about a quarter of residents in those apartment blocks are families with