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So first and foremost, we have the idea. Then, themselves the product of ideas, we have the more obvious mechanics of entrapment in matter, energy, space and time.
The most common barrier which man recognizes as such would be a wall. This is so obviously a barrier that individuals quite commonly suppose all barriers to be composed of solid walls. However, almost any object can be made into a barrier. A less common use of an object as a barrier would be one which inhibited, by some sort of suction or drag, a departure from it. A solid lump of considerable magnetic properties will hold to it a piece of steel. Gravity is, then, a barrier of a kind. It holds the people or life units of Earth to Earth.
Another barrier would be energy. A sheet of energy or something carrying energy, such as an electrical fence, can prove to be a formidable barrier. A cloud of radioactive particles obstructing passage into another space would also be a barrier.
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