With reference to the personality classification of the typological approach presented by Ernst Kretschmer and William Herbert Sheldon, according to Sheldon's 'Somatotypes' theory, which body type is most deeply associated with high intellectual capacity, artistic sensitivity, introverted temperament, and extreme delicacy of the nervous system?

William Sheldon classified personality into three major somatotypes based on body build: Endomorphy, Mesomorphy, and Ectomorphy.

Key Characteristics of Ectomorphy:

• Physical Build: Tall, thin, fragile, and delicately built body structure.
• Psychological Traits: Highly sensitive, introverted, intellectually inclined, and artistic.
• Temperament: Associated with 'Cerebrotonia' temperament, characterized by restraint and privacy.