cool optical illusions

Link worked. Too complicated for this time of night. Maybe tomorrow. . . .

Hi Roger - it was the square bracket at the end. Instead of https://t.co/5iQR5WZg6y]
https://t.co/5iQR5WZg6y

This is not moving



https://t.co/Wm08PslTDM

@Rainmaker1973
The image is completely static, but will give you a growing sense of darkness, as if entering a space voided of light. When the central region is black, our pupils are probably preparing us for a change of luminance in the near future

[full paper: https://buff.ly/3m2ASJq]