Full Idea
Some have claimed that sets should be rethought in terms of still more basic things, categories.
Gist of Idea
Maybe sets should be rethought in terms of the even more basic categories
Source
William D. Hart (The Evolution of Logic [2010], 2)
Book Reference
Hart,W.D.: 'The Evolution of Logic' [CUP 2010], p.58
A Reaction
[He cites F.William Lawvere 1966] It appears to the the context of foundations for mathematics that he has in mind.