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Computers, then, have engineered layers of abstraction, each deriving its capabilities from joining together simpler instructions at a lower layer of abstraction. But each layer uses its own distinct concepts, and each layer is causally closed — meaning that it is possible to understand the behavior of one layer without recourse to the behavior of a higher or lower layer. For instance, think about your home or office computer. It has many abstraction layers, typically including (from highest to lowest): the user interface, a high-level programming language, a machine language running on the processor, the processor microarchitecture, Boolean logic gates, and transistors. Most computers will have many more layers than this, sitting between the ones listed. The higher and lower layers will likely be the most familiar to laymen: the user interface creates what you see on the screen when you interact with the computer, while Boolean logic gates and transistors give rise to the common description of the computer as “just ones and zeroes.”