It was not something of eidetic memory

To what imply "something" in It was not something of eidetic memory? I just don't understand this form of expressing... and try to understand

. And I think, as limited as our memory might be, I am sure that you can still recall the little memory feat in the beginning. And you might have asked yourself what I did there. It was not something of eidetic memory because I think that does not exist. What I did there was I used something called the "method of loci." I used a number of locations in a fixed sequence and put the information on the location.

At 4:52