Plenty of willow in the museum.You can still see the city from Optus from the viewing platforms / bars on the top deck.
Maybe the MCG needs an outwards extension on level 2 or 3 just like this and the tree huggers can go stare at nature during the breaks to get their fill as it would have been at least 30 minutes since they saw a tree outside the stadium. Maybe it already has this as I haven't been there for awhile and didn't spend my time looking for options of seeing what was outside the stadium while i was in it.