Reverse Phi: Four-Stroke Cycle

Scroll down and click on each four-stroke cycle movie. The objects appear to move continuously without changing their average position.

[quicktime width=”600″ height=”400″]http://anstislab.ucsd.edu/files/2012/11/S1.mov[/quicktime]
Expansion/contraction
[quicktime width=”600″ height=”300″]http://anstislab.ucsd.edu/files/2012/11/S2-1.mov[/quicktime]
Vertical movement
[quicktime width=”600″ height=”300″]http://anstislab.ucsd.edu/files/2012/11/S3-1.mov[/quicktime]
Horizontal movement
[quicktime width=”600″ height=”300″]http://anstislab.ucsd.edu/files/2012/11/S4-1.mov[/quicktime]
Rotation

Each movie is four frames long, in the sequence positive-positive-negative-negatives.