is about the number of things you can stand to look at without a "brain rebellion", i.e. a demand to 'do something' to put the mess into an understandable structure (hierarchical). It's the number of things that will fit in your "conscious attention bin". I suspect that this number is related to the aforementioned '7' and might be equal to (2^7 -1).
1 + 2 + 4 + 8 + 16 + 32 + 64 + 128 = 256 - 1
This would be seven levels of 'halved' concepts.
Then again it might be 2^6-1 = 127 or anything round about these numbers depending on the individual.
Or better yet, 216 +36 +6 =258 , meaning that we take our couple hundred objects and cut them into 6 (or seven) piles, then cut each pile into 6 or 7 things also which contain 6 or 7 things themselves. They can then be bussed around the brain as single (yet divisible) units without having to make more trips on the next clock cycle.
I may get some negative feedback on this but ... there is a number that's around 100+ to 200+ ... that we really need to get divided. That's why paragraphs exist. For reasons similar to the foregoing 'sentence' rationale. You don't want to see a paragraph in this document, or any other, with 500 or 1000 words in it. You lose track. You can't hold the data in consciousness with any reliability. You begin to 'drop' things (forget) and have to go back to the beginning.
We need to take in information in packets which can be handled by our inherited, physical brain structure and reason on it (Identify and Understand) before we can go on to the next packet.