When a picture has to be precipitated the method is precisely the same, except that here it is absolutely necessary that the entire scene should he visualized at once, and if many colours are required there is of course the additional complication of manufacturing them, keeping them separate, and reproducing accurately the exact tints of the scene to be represented. Evidently there is scope here for the exercise of the artistic faculty, and it must not be supposed that every inhabitant of the astral plane could by this method produce an equally good picture; a man who had been a great artist in life, and had therefore learnt how to see and what to look for, would certainly be very much more successful than the ordinary person if he attempted precipitation when on the astral plane after death. [Sidenote: Slate-writing.] The slate-writing, for the production of which under test conditions some of the greatest mediums have been so famous, is sometimes produced by precipitation, though more frequently the fragment of pencil enclosed between the slates is guided by a spirit hand, of which only just the tiny points sufficient to grasp it are materialized. [Sidenote: Levitation.] An occurrence which occasionally takes place at _seances_, and more frequently among eastern Yogis, is what is called levitation--that is, the floating of a human body in the air. No doubt when this takes place in the case of a medium, he is often simply upborne by "spirit hands," but there is another and more scientific method of accomplishing this feat which is always used in the East, and occasionally here also. Occult science is acquainted with a means of neutralizing or even entirely reversing the attraction of gravity, and it is obvious that by the judicious use of this power all the phenomena of levitation may be easily produced. It was no doubt by a knowledge of this secret that some of the air-ships of ancient India and Atlantis were raised from the earth and made light enough to be readily moved and directed; and not improbably the same acquaintance with nature's finer forces greatly facilitated the labours of those who raised the enormous blocks of stone sometimes used in cyclopean architecture, or in the building of the Pyramids and Stonehenge. [Sidenote: Spirit Lights.] With the knowledge of the forces of nature which the resources of the astral plane place at the command its inhabitants the production of what are called "spirit lights" is a very easy matter, whether they be of the mildly phosphorescent or the dazzling electrical variety, or those curious dancing globules of light into which a certain class of fire elementals so readily transform themselves. Since all light consists simply of vibrations of the ether, it is obvious that any one who knows how to set up these vibrations can readily produce any kind of light that he wishes. [Sidenote: Handling Fire.]