The root idea of frontness has already been explained. A child or a young of animal is born by being brought forth from its mother's womb. The idiom ‘ to bring forth’ conveys the idea of bringing to the front. When a man comes out of his residence, his appearance at the main entrance, in a way, resembles coming into existence. That also is a coming to the front.

      All moving creatures have to go out of their living-places for some purpose or other such as procurement of food, and social affairs, and all physical movements are naturally directed forward.

      When movement is progressing the destination is nearing. When two or more things of the same class get close to one another, there is meeting.

      When two things get closer and touch each other, it is contact.

      When an impenetrable obstacle is met with on the way, the moving creature or instrument has to turn aside, as a street walker meeting with a blind alley, a traveller with a well or hill, a root with a stone, a nail with a hard brick, and so on.

      When the obstacle is penetrable, or when a hole or hollow is to be made in the ground or in a piece of wood, boring takes place.

      When anything is bored through, as a mountain by tunnel-workers, a rotten wood by wood-worm, a book by moth, a cake of cow-dung by dung-beetle, a man's chest by a sword, a piece of wood by an auger, and so on, it is penetration.

      When penetration is complete, the penetrating thing makes its appearance once again, and the nonary semantic cycle begins to repeat itself.

     By an extension of meaning, passing through an open space also will be treated as penetration.

      Ideas branch and sub-branch into several or many species of varieties, a number of times in succession. Each of the nine major ideas constituting the nonary semantic cycle is capable of