I named the image of every material which was shown to you when a material reflects light, the reflected image. Everything, including this book, that we see consciously or unconsciously belongs to the category of reflected image.

Hence all the materials seen before your eyes exist in the world of reflected image. In addition to the known world, this book proposes the world of penetrated image, where we see another image of a material which has been invisible to us.

When seeing a material through reflection, we can observe only its outer world even though it contains an inner world. Seeing it through penetration, we can finally observe its organic world for the first time.

It is well known that our retinae is a kind of sensitive film which is made so delicately by God so that it can respond to visual light keenly. They can perceive both penetrated and reflected visual light.

All creatures' eyes probe the wave of visual light from morning to night. In other words, they probe the waves of visual light to certify whether or not any material including this book exists.

At the end of this book, I have enclosed a letter from the American Physics Association(APA) which deals with the investigation of this study. Reading it, you will find why APA did not publish this book.

What kinds of material are caught by the wave of visual light? All materials, existing not only in the world of reflected image but also in the world of penetrated image, belong to this category.

Figure R is seen whenever you perform the experiment in the first part of this book. Figure R is clearly shown in the inside of Figure C and this inner part has never been discussed in the field of physics. Now, I finish Chapter 2 and will talk more at a later time if possible.