Eyes draw auxiliary lines before insight moment

The human eyes are a powerful sensor to detect valuable objects, and of the valuable structure among objects in the environment. Scientists executed experiments on these balls, for investigating the attention of human in searching things to buy and in exploring clues for problem solving. The shift of attention target toward insight has been reported in previous studies, but it has not been clarified how logical ideas of human is emerging for the short time attaining insight. This paper reports the discovery that the orbits of eyes´ target movement just before insight can be regarded as auxiliary lines, i.e., lines which externalize the hidden relationship of objects which accelerate the human´s deeper thought. The experiments were executed for subjects looking at artificial products and artworks and also for subjects designing a new city on a map. The snapshots of eye movements can be interpreted as reflecting the subjects´ interest in combining basic parts to make a valuable structure. By showing the snapshot just before insight to subjects themselves, they tended to notice why they attained insight and could explain the value of the objects to others.