Describing in terms of rough comparison

"Look - here's a table covered with a red cloth. On it is a cage the size of a small fish aquarium. In the cage is a white rabbit with a pink nose and pink-rimmed eyes. In its front paws is a carrot-stub upon which it is contentedly munching. On its back, clearly marked in blue ink, is the numeral 8."
"it is described in terms of rough comparison, which is useful only if you and I see the world and measure the things in it with similar eyes."
"We all understand the cage is a see-through medium; beyond that, we don't care. The most interesting thing here isn't even the carrot-munching rabbit in the cage, but the number on its back. Not a six, not a four, not nineteen-point-five. It's an eight. This is what we’re looking at, and we all see it."
(#2 p.97-98)