Systems of classifying odors include: * Crocker-Henderson system, which rates<unk> s on a 0-8 scale for each of four "primary"<unk> s: fragrant, acid, burnt, and caprylic. * Henning's prism * Zwaardemaker<unk>  system (invented by Hendrik Zwaardemaker)
Sense of smell
Affective sensation
Visual perception
Sense of balance
Sensory phenomena
Pain tolerance
Sensation 
Color vision