H. P. Grice on H. H. Price's Tomato

When I see a tomato there is much that I can doubt.

I can doubt whether it is a tomato that I am seeing, and not a cleverly painted piece of wax. I can doubt whether there is a material thing there at all…

One thing however I cannot doubt: that there exists a red patch of a round and somewhat bulgy shape, standing out from a background of other colour-patches, and having a certain visual depth, and that this whole field of colour is presented to my consciousness…that something is red and round then and there I cannot doubt…that it now exists, and that I am conscious of it—by me at least who am conscious of it this cannot possibly be doubted…

This peculiar and ultimate manner of being present to consciousness is called being given, and that which is thus present is called a datum. (H. H. Price, Perception, 1932, p.3.)