Before we talk about blackboards, we need to talk about existence and application, and on another level, we need to discuss coexistence. This essay requires for it to be philosophical, and philosophy is not about how we elaborate a point, it is about how we reach it (objectivity through subjectivity). No matter what we discuss, we'll never be far off from the process of justification of a blackboard.

A thing that does not carry a function is against everything that does. This implies that existence has no identity except a very basic identity that comes from the acknowledgement that it is not non-existence. Application is strictly not non-existence. Thus, application solely determines existence. Actually, the application of a thing determines its substance and the substance conveys its existence.

The substance of a thing is the extent of its purpose. The purpose of a thing is the lowest level of its function substance is the highest. The variation held between both these ends is application. Existence hence becomes a very fundamental generalization of application. Or in more precise terms, as believed earlier, application determines existence. A thing devoid of application is non-existent, i.e., for a thing to be real, it must be, even in the least sense of possibility, usable.

A blackboard solely serves no application. Without a chalk, there is no variation or extent of its purpose. It constantly portrays a need to gain substance. A chalk and a blackboard must combine in identity to render application. They do not commit the same application they commit the one application only. This calls for an accurate understanding of coexistence. The basis of coexistence is a demand on dependability. When we depend on something, we are subverted by it. The subversion comes from the thing's vantage point to control our need. It gets more complex when this dependability is absolutely mutual. Two things that are reliant on each other can neither exceed nor escape a common state of subversion. They become a means to one common application. A thing that finds itself in a coexistence is nothing except a partial end-product. Coexistence is a minimal sort of existence. When something coexists, it resorts from actually existing to subsisting as a situation. A chalk and a blackboard subsist in a situation as such that without inter-dependability or coexistence, their individual existence does not make sense. A blackboard is a blackboard is a blackboard. A chalk is a chalk is a chalk.

To the human intellect, a thing shall only make the basest sense when it is productive. A ?blackboard? hence, theoretically speaking, does not exist. However, ?a blackboard and a chalk?, do exist, almost as wholly as the human torso.

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