On the left, we show the result of a typical eye-tracker recording of a search task on a complex landscape (not shown)30. The basic elements of eye movement are clearly present, namely the numerous sets of fixation points connected by large jumps (saccades)5. In this particular searching test, the points of fixation bunch up around some regions, where certain details of the image demand more attention than others, however, one can not perceive any systematic pattern in the trajectory of the eyes. On the right, part of the image is enlarged, where the red circle indicates the location of the target. The recording process ends when the target is found.