For the student of visionary art the interesting fact is that an image comes first and takes up residence in the mind long before the artist has any notion why it is there or what it means. Whether visions come from some great reservoir of symbolic images which are eternally there (and if one examines the recurrence of images in history this proposition is not quite as crazy as it sounds) or whether they are due to buried memories, their obsessive power over an artist's mind, and their clear, compulsive emergence in his work depends on a mental condition that can come and go. When, for some reason, they no longer present themselves to the mind's eye, alive or clamoring to be born, the visionary artist has a hard time - dark days. This is particularly true if he has lost the habit of feeding his mind on the observation of nature.