Straight
or divergent?
The rows
seem to diverge, actually this is just an illusion!
(see
also the anthropomorphic
variant of this illusion) |
Concave...
convex? |
| How
many cubes do you see simultaneously... One or two cubes? |
 |
|
Can you
perceive when the spinning mask becomes concave? Impressive, isn't
it? |
Motion
creates shapes |
 |
When
some of the dots move you will recognize a familiar figure
in motion, but without its apparent contour (a figure
is usually distinguished from its background by a line border
called a contour). There are circumstances when a figure
can be perceived although contour does not exist. This can
occur when a figure is in motion relative to a background.
The figure shown opposite is visible only during its motion
(when motion ends the figure ceases to be visible...) |
|
Strange
Motion Effects |
Which
direction is the rotation? Observe attentively the right gear below.
You should be able to see it rotates clockwise or anticlockwise
while the red pointer always rotates clockwise. To get the
effects to switch direction, blink or look away briefly.
 |
Another example. Which direction rotates the large
blue gear above? Same effect as in the previous image! |
Boing Effect |
| The
sequences of this animation are made by modifying the width of
the alternate black and white horizontal lines which form the background
motif. The animation creates a funny "boing" effect |
 |
