Isn't it simply a PCA/DimRed? i.e. I am the sum of all trillion of my features, but I am also mostly the sum of a set of a few thousand informative ones combin

Isn't it simply a PCA/DimRed? i.e. I am the sum of all trillion of my features, but I am also mostly the sum of a set of a few thousand informative ones combined in linear/nonlinear ways You could drop a verse or two of Shakespeare from my memory and I'd probably still be recognisable to myself and those around me