Items put on the Common Property

Hi

I have a situation in my building where a very unattractive table and bike have been put by an owner in the front foyer of one of the stairwells.  The table is up against a wall and the bike is chained to the steel stairwell.  They both have been there for a few months and I have recently mentioned it to our Strata Manager. He has told me that he has been instructed that the items are to stay there until it is raised at the next AGM at the end of August, where he will ask only those present if there is a problem with them being there.

My question is firstly are they allowed to be there, secondly can they be removed and finally is it within his jurisdiction to being ask the question?  Does whoever put them there need some kind of approval?

Thanks!