About the book: 2019 / Any object, liquid, air and even airless space is space! Some spaces are capable of changing shape. Some are capable of separating. Some are capable of combining (air and liquids). Spaces can be solid, with holes and with internal cavities. The joints of one plane with another form a line. And the junction of three planes forms a point. Points cannot form any joints. Thus, a point is the third and final measure of the section of space. This means that space is three-dimensional and only three-dimensional! A drawing by the author was used to design the cover.