How many black dots are there?
Is the blue part in front of the object or in back of the object?
Are the lines straight or curved?
Are you looking at theis from left to right or right to left?
How many legs does this elephant have?
Is this image possible?
Is this image possible?
Is this knot pairing of tringles physiclly possible?
Are the red lines straight or curved?
This image appears to buldge but it only consists of squares?
Do you see a duck or a rabbit?
Which line is bigger AB or BC?
Which object is bigger?