
Here’s an example: Jack and Jill are persons who know each other. Per Hofstadter’s idea, the knowledge of Jill in Jack’s mind is as much a valid part of Jill as Jill's physical body is part of Jill. But the knowledge of Jill in Jack’s mind is “low res.” compared with the knowledge of Jill in her own mind. Jill’s actual body and mind are at the highest res available.
Extending the idea: A photograph of Jill is part of Jill. And so too are letters written by Jill, letters written about Jill, clothes worn by Jill, memories of Jill in the minds of her friends: these are all parts of Jill. Every part and aspect of reality touched by Jill in any way, is part of Jill — the “Greater Jill”, the total, aggregated footprint of Jill upon Reality.
Perhaps the most significant difference between the various parts or aspects of Jill is the extent to which each is subject to change. Everything is subject to change, but some things change less than others. A digitized photograph of Jill uploaded to the internet is less subject to change than Jill’s physical body.