Is the ladder going up or down?
Are the dots in between the squares white, black or grey?
parallel or crooked?
How many legs?
Focus on the dot in the middle and then move your head backwards and forwards.
Is the picture moving?
Is there anything in between the different squares?
face of a lady or a word?
Focus on the 4 dots in the middle of the picture for 30 seconds.
even possible?