Describes a double pendulum apparatus and its mode of operation to produce a great variety of figures similar to Lissajous figures. The author suggests that several advanced physics topics can be studied with the aid of this instrument. Bibliography. (LC)

Training improves the ability of human observers to discriminate between two similar directions of motion. This gradual improvement is specific to the direction on which an observer is trained, enduring for several months. Improvement does not affect motion perception generally, nor does it depend on recognition of details of the movement. (Author)

Results of two studies were consistent with the view that 3-month-old infants perceive movement in depth during their own movement. They can move to avoid a surface just prior to contacting it. (Author/RH)

Assesses the effects of the specific route traveled, intervening barriers, and different lengths of routes on the spatial knowledge of second graders, sixth graders and college students for a novel experimental environment. (MP)

Provides information on the calculation of the redshift to blueshift ratio introduced by the transverse Doppler effect at relativistic speeds. Indicates that this shift should be mentioned in discussions of whether quasars are "local" rather than "cosmological" objects. (GS)

The evolution and change in Alexander Calder's mobiles--from the mid-1920's to his death in 1976--are discussed, and it is suggested that the creative art teacher can easily use Calder's design techniques to enhance an art education program. (KC)