User blog comment:Edwin Shade/There is No Limit To Googology/@comment-31663462-20171120001610/@comment-30754445-20171120142447

I think you're both right.

On the one hand, there are hard physical limits (size of the universe, capacity of the human brain, etc).

On the other hand, the number of possible ideas which can fit (say) a human brain is so large that this hard limit is practically irrelevant. We'll never get anywhere close to the "most efficient googological system that can fit into a human brain", so thinking of smarter ideas will always be more efficient than using up more space.