Conclusion
Only a few metaphysical technologies are covered in this course. There are multitudes of them. There are others being invented even in this moment! This course is only an introduction to the fact that there are ways to alter your consciousness, your health and your emotions using tried and true methods that have metaphysical beginnings.
It might be quite useful on your spiritual path to purchase some of these gadgets that have been described, it might not. It is not necessary to have them, but they are able to create states of mind that you have been struggling for in meditation and spiritual endeavors. Meditation tapes are a great way to go of course, but manipulating brainwaves is also a useful medium. It depends on what you are trying to achieve. If you are trying to learn lucid dreaming, perhaps the Nova-Dreamer is for you, but you will need a lot of money to get one. If you are trying to learn how to relax, perhaps the bio-feedback machine is for you. If you are trying to resist the urge to do psychedelic drugs that harm your body, but you want to see the trippy patterns people report on them, perhaps the sound and light machine is for you.