There is a third kind of illusion, a suggestive art in which a suggestion is made of a certain idea or action, so that only the mind developed enough to comprehend it may know it, although to all others it stands as a picture. This no doubt requires an awakening mind with creative power, and in this the artist has an opportunity in the realm of art to convey his thought to others. The artists of ancient times were generally mystics, and they always expressed their thoughts concerning the law of life and nature, their imagination of heaven, in art.