Full Idea
The elements of all geometrical constructions are intuitions, and geometry appeals to intuition as the source of its axioms.
Gist of Idea
Geometry appeals to intuition as the source of its axioms
Source
Gottlob Frege (Rechnungsmethoden (dissertation) [1874], Ch.6), quoted by Michael Dummett - Frege philosophy of mathematics
Book Reference
Dummett,Michael: 'Frege: philosophy of mathematics' [Duckworth 1991], p.68
A Reaction
Very early Frege, but he stuck to this view, while firmly rejecting intuition as a source of arithmetic. Frege would have known well that Euclid's assumption about parallels had been challenged.