The blue-eyed Siamese has a highly characteristic shape, being slim, elongated and angular.
For the stay-at-home this is the best cat. It follows its servant everywhere, loudly commenting on everything and attempting to explore whatever gets in the way. A real tragedy for this cat is to be left alone, so it's best for big families.

The Siamese has been used as the ancestral cat for a number of recent breeds, each modifying the original form in one way or another. These modern descendants of the Siamese include the following:
1. Balinese (Longhair Siamese with points)
2. Javanese (Longhair Siamese with new-color points)
3. Oriental Longhair (Longhair Siamese without points)
4. Oriental Shorthair (Shorthair Siamese without points)
5. Coporpoint Shorthair (Shorthair  Siamese with new-color points)
6. Havana (Shorthair  Siamese with solid brown coat)
7. Foreign White (Shorthair  Siamese with all-white coat)
8. Seychellois (Shorthair  Siamese with splashed white coat)
9. Ocicat (Shorthair  Siamese/Abyssinian)
10. Snowshoe (Shorthair  Siamese/American Shorthair Bi-color)
11. Tonkinese (Shorthair  Siamese/Burmese)

Further reading for Siamese's lovers:
Siamese Cats : Everything About Acquisition, Care, Nutrition, Behavior, Health Care, and Breeding (A Complete Pet Owner's Manual)  by Marjorie McCann Collier, Michele Earle-Bridges (Illustrator)
The Complete Siamese by Sally Franklin