Logical development of physical theories is hindered by a lack of rational mechanisms of interactions between material bodies. This has led to many illogical assumptions. The concept currently used to facilitate interactions between material bodies—the ‘action at a distance through empty space'—has no mechanism of action. Vague forms of fields and aether, which are also in use, suffer lack of logical structure or mechanisms of action. Until these are replaced by a concept of a rational as well as a real entity to facilitate as a medium between the material bodies, the development of physical theories will continue to become more and more irrational. Matter is the only real entity in the universe. Hence, it is logical to expect the matter to provide structured material bodies as well as a universal medium that interlinks all material bodies in nature. Matter itself has to be in the form of an infinite number of basic matter particles. A logical theory based on only one type of postulated matter particle will lead to the development of an ideal universal medium. This universal medium should be able to account for all physical phenomena in nature, under the same rules and under all conditions.