Discusses the size-weight illusion that occurs when a person lifts two equal-weight objects differing in size and perceives the larger object as lighter than the small object. Describes several inexpensive techniques for demonstrating the size-weight illusion and reviews some relevant issues concerning this phenomena. (MJP)

Maintains that having students estimate the size and width of a class waste paper can (placed on a desk) is a simple and effective way of illustrating perceptual distortion. Tests show that people will consistently overestimate the height of the can, allowing for a useful discussion on sensory distortion. (MJP)

The critical need for school reform cannot be separated from social reform. It is necessary, therefore, to go beyond the limited scope of curriculum modification to the process of learning how to take every element of an educational experience, raise it to a conscious level, and relate it to a universal struggle around a system of democratic…