Full Idea
You can entertain thoughts of things like tomatoes without a grasp of what they are.
Gist of Idea
You can think of tomatoes without grasping what they are
Source
John Heil (The Universe as We Find It [2012], 08.10)
Book Reference
Heil,John: 'The Universe as We Find It' [OUP 2012], p.178
A Reaction
Lowe seemed to think that you had to grasp the generic essence of a tomato before you could think about it, but I agree entirely with Heil.