Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/zhenxiangba/zhenxiangba.com/public_html/phproxy-improved-master/index.php on line 456 Y-junction spirals
Spiral illusion with the illusions of Y-junctions
Concentric arrays of stars appear to be spirals. In addition, the figure appears to rotate counterclockwise (clockwise) when observers approach (leave) this figure with fixating at the center.