Is this an apple tree or an orange tree. The only way to find out is to stare at the red dot for thirty seconds and then look at a white wall or ceiling and maybe keep blinking.
Stare at the black dot in the third car on the right for 30 seconds or more then your eyes will create a black car that you might be able to "park" between the other two, if you have good eye coordination.
Stare at the countdown until the beautiful lady finally appears.
Original image source unknown - Animation by Optical Spy
Keep staring at the red dot until the picture changes then keep your focus on the blue dot for the best effect.
Image source unknown
Well actually a dark Zebra. Just stare at the center spot until the countdown finishes and then when the black shroud is lifted from the the left hand side of the picture the right hand side seems to get darker.
Stare at the picture on the left for one minute then look into the white space on the right to see the ghost.
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