Equality 7-2521 and Liberty 5-3000 stand out from the other characters because of their physical beauty. Both of them are young, tall, strong, straight, slim, and gorgeous. Their looks reflect their individual pride, fearlessness, and strength of character. In describing Liberty 5-3000's eyes, Equality 7-2521 even explicitly says they express those qualities. Everyone else seems to be hunched, weak, dull-eyed, and sickly looking.
http://www.shmoop.com/anthem-ayn-rand/characterization.html
Equality 7-2521 in "Anthem" is described as tall, with light hair and grey eyes. He is also depicted as strong and athletic, with a sense of independence and curiosity that sets him apart from the other characters in the story.
The address of the Cave City Branch Library is: 120 Spring Street, Cave City, 72521 0240