A powerful king kept all the treasures of his conquests in one of the most impregnable rooms of his castle. To ensure that no one but him could access the treasure, four guards took turns day and night to monitor the room flanked by a door with several locks. The king had handed out the keys of the different locks so that only he, accompanied by any one of his guards, could open it.
Look at the hat in the picture. Is it taller than wide? Or is it wider than tall? Solution The width of the hat is exactly equal to its height. The cause of the deception is based on the effect produced by two perpendicular segments that, even though they are equal, the vertical will always appear greater, in an approximate proportion of 30%.
Stare at the two lines ... do you think they are parallel lines? Solution Although they may not seem so, they are straight and totally parallel, what happens is that our eyes deceive us. The fine lines of the bottom that leave the black circle cause an illusion making us appear that the two thickest lines are separated by the central part.