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perpendicular planes

Two planes in 3-dimensional space are perpendicular if normals to the two planes are perpendicular. If n 1 and n 2 are vectors normal to the planes, this is so if ...

kinetic depth effect

kinetic depth effect n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...when the object is held obliquely and rotated about its centre, causing complex transformations that make the shadow appear to move in front and behind the surface on which it is cast. The three-dimensional effect disappears if the rod stops moving, or if it rotates in a plane perpendicular to the surface on which the shadow is cast, causing the shadow merely to lengthen and shorten as the rod rotates. It is closely related to the windmill illusion . See also structure from motion . KDE abbrev...

Pulfrich effect

Pulfrich effect n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...effect n . A visual illusion that is seen when a pendulum such as a length of string with a weight attached to one end is swung from side to side in a plane perpendicular to the line of vision. If it is viewed from a distance with a lens from a pair of sunglasses or a similar dark filter over one eye but with both eyes open, and with attention focused on the centre of the swing, the pendulum appears to move in an ellipse parallel to the floor, clockwise as seen from above if the dark lens is over the left eye and anticlockwise if it is covers the right...

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