In this case, the images we present show different objects at different distances. The perception of the proximity or remoteness of the objects is made from the lines that converge at a vanishing point. So in the images that we present you are shown figures of different sizes and The question we ask is if you are able to find the largest figure in each image.
Believe it or not the figures in each image are all the same size. We interpret the depth lines as the recreation of a 3D space so our brain assumes that the farthest objects are shown in a smaller size and that is why we identify them with a larger size of the real one when compared to the other characters in the picture.