Something that is surely implicit in the claim that the limits on economic growth are not related to physical resource limits, is some definition of the minimum

Something that is surely implicit in the claim that the limits on economic growth are not related to physical resource limits, is some definition of the minimum quantity of stuff, and perhaps of the types of stuff, that are required to make this possible. I find it relatively easy to imagine that there is some quantity of material that would allow a group of people to exist in an approximately steady state economy, with economic value being consumed roughly at the rate at which it is produced (i.e. zero growth). However, it is not clear to me that there is fixed quantity above which one can achieve continued (i.e. unbounded) economic growth. This seems to imply that it is possible to come up with infinitely many, increasingly useful, ways of using the same stuff. Is it possible to achieve continued economic growth in an empty room?