Count the black dots .
Are the horizontal lines parallel or do they slope?
How many legs does this elephant have?
Keep staring at this black dot after a while the grey haze around it will appear to shrink .
Man playing horn or woman sillhouette ?
A rabbit or a duck?
Look at the chart and say the COLOUR not the word .
Woman in vanity...or skull?
A face of a native ..American or a Eskimo?
See the baby ?