"A Glass Cat!" exclaimed Ojo, astonished. "Yes; she makes a very pleasant companion, but admires herself a little more than is considered modest, and she positively refuses to catch mice," explained Margolotte. "My husband made the cat some pink brains, but they proved to be too high-bred and particular for a cat, so she thinks it is undignified in her to catch mice. Also she has a pretty blood-red heart, but it is made of stone — a ruby, I think — and so is rather hard and unfeeling."

The Glass Cat is one of the most curious creatures in all Oz. It was made by a famous magician named Dr. Pipt before Ozma had forbidden her subjects to work magic. Dr. Pipt had made the Glass Cat to catch mice, but the Cat refused to catch mice and was considered more curious than useful.
This astonishing cat was made all of glass and was so clear and transparent that you could see through it as easily as through a window. In the top of its head, however, was a mass of delicate pink balls which looked like jewels but were intended for brains. It had a heart made of a blood-red ruby. The eyes were two large emeralds. But, aside from these colors, all the rest of the animal was of clear glass, and it had a spun-glass tail that was really beautiful.

You're a cat," she said automatically.
"Your powers of perception are astounding," the cat drawled. "Although I feel obliged to point out, in the interests of ontological exactitude, that I am in fact only half cat. Personally, though, I have always considered it the better half.

A cat is more intelligent than people believe, and can be taught any crime.

A cat loped across my gaze with a squint-eyed, piratical look, and a suave grin.

Cats are very intelligent at all the things that cats need to be intelligent about.

I believe cats to be spirits come to earth. A cat, I am sure, could walk on a cloud without coming through.

A cat will blink when struck with a hammer.

He thought, looking at the cat, if only you were the intelligent species on this world. And then, smiling wryly, maybe you are.

A cat has absolute emotional honesty: human beings, for one reason or another, may hide their feelings, but a cat does not.

Eyes so transparent that through them one sees the lucent soul.

It always gives me a shiver when I see a cat seeing what I can't see.

You now have learned enough to see That Cats are much like you and me And other people whom we find Possessed of various types of mind. For some are sane and some are mad And some are good and some are bad And some are better, some are worse — But all may be described in verse.

"I've heard that you're the cat's whiskers, M. Poirot."
"Comment? The cat's whiskers? I do not understand."
"Well that you're It."
"Madame, I may or may not have brains - as a matter of fact I have - why pretend?"