An illusion is an inaccurate perception of a real external object, indicating a sensory distortion. The most common illusions are visual, auditory, or tactile in nature, although smell and taste ...
The full details are described in 'The Thatcher illusion 28 years on...' (Perception, volume 38: pages 921–922). 2. Thompson P (1980) 'Margaret Thatcher: A new illusion' Perception, volume 9 ...