The quality or condition of being capable of perceiving with a sense or senses, responsive to external conditions or stimulation, or susceptible to the attitudes, feelings, or circumstances of others. Also, the degree to which something may be affected by something else, as rods and cones on the eye's retina and photo-reactive components of photography are affected by light. In the latter case this may refer to the degree of response of a photographic plate, film or paper to light, especially to light of a specified wavelength.Quote: "I'm not an actor. What does it mean, 'celebrity'? I call myself an artisan. Anyone with sensitivity is potentially an artist. But then you must have concentration besides sensitivity." Henri Cartier-Bresson (1908-2004), French photographer and drawer. See artisan and photography. Also see expression.