How do things start to appear or seem? This question is given an answer in Hegel's Logic. The Encyclopedia Logic, i.e. the "Lesser Logic," gives a basic outline of this solution. The solution is then developed in more detail in the Science of Logic or the "Greater Logic."
Semblance is called the "shine" [Schein] in Hegel. Appearance is a logical form which is a further specification of what "shine" is. However, with the category of shine, an answer to the above question is already given. Therefore, the real next question is to see how "shine" is posited. This means to ask how being becomes essence, for "shine" is a determination of being as it turns into essence.
I will trace the path of being becoming essence backwards. First, shine is immediate being, but an immediacy which is also posited. The concreteness or "givenness" of shine is due to its immediacy; however, at the same time this givenness is cancelled by the idea that there is, implicitly and only negatively, another being, or rather a nothing, behind this shine. For example, water may appear immediately as liquid. As a quality, water just is this liquid, or water is as it is immediately. However, as shine, the liquid is only one among the many forms of water. Behind the immediate, liquid being of water, there is also "water as such," as well as steam and ice as two other forms of water. The "water as such" can then receive various other determinations, whether that be physical, chemical, artistic, or religious. All of these determinations of the forms of water are not immediately present. Thus, these constitute the "essence" of water. But this essence, since it is not, can only be conceived as nothing.
This nothing, which is essence, is however a very determinate nothing which is posited or "punched" out of the immediate being of water, in this case its liquid form. Therefore, essence is not some arbitrary, abstract nothingness, but rather a nothingness posited by immediate being. How does being posit its own essence?
This question takes us a step back into the category of measure. Measure is the final category of being. It is comprised of two other categories, namely, quality and quantity.
1. Quality is the result of the abstract dialectic of being and nothing. It is either a being which has been nothing, and thus is a limited being, or it is a nothing which is a limited nothing in the same sense. Quality is therefore a One which excludes other ones. This means, for Hegel, that each One is negatively related to other Ones. In order to determine itself through the others, the One must in some sense reach out to its others. The One must then determine itself by determining what counts as the negative of itself. For example, the color green is one quality which is not only green in itself, but also is green by virtue of the fact that other colors are not green, and it is part of the quality of green to specify what counts as not green. The next step in the dialectic is to recognize that quality can also penetrate others, and determine its character positively through others. For example, alongside "green as such," there is a "patch of green," a "green sphere," a "green leaf," etc. Here, the quality of green becomes concretely so only through the negation of the other qualities which it internalizes in its various determinations. The "green as such," when contrasted to the "green of the leaf," is clearly still abstract, not yet fully green. The fact that various qualities can serve as the internal relation of the quality of green is what Hegel calls "attraction." By contrast, the fact that green becomes concrete by internalizing other qualities, and thus separating itself from other qualitative determinations of green, is what Hegel calls "repulsion." The many qualities of green becomes the quality of green through attraction. This last movement is expressed by the formula: "the One becomes One through the many ones." With this, however, the quality green becomes indifferent to its being related to other qualities. This indifference is not itself a quality, but something else: quantity.
2. Quantity is the indifference of the constituted quality with respect to other qualities. This indifference is, however, a result of the dialectic of the One and the many. The two basic determinations of quantity are brought over from these of quality. The One is the unit, the many is the amount. At first, and in the abstract, what counts as unit and what counts as amount is quite arbitrary. For example, what counts as the unit of a quantity of water can be any amount of water. However, when quantity is considered as an abstraction from quality, the situation becomes different. For example, after a certain point, green turns into red, or any other color, which is a different quality. In this way, the amount of green becomes limited, and the unit of green also becomes determinate. However, still, green can have various intensities and degrees. But with this connection between quantity and quality, quantity is no longer indifferent to its qualitative basis. Instead, it is now a different category: measure.
3. Hegel calls measure a "qualitative quantity." In measure, a quality is determined as having a certain quantity. Moreover, in the development of measure - which I will discuss in more detail on another occasion - one quality is determined or constituted by another quality by virtue of a specific quantum associated with both qualities. This can take the form of simple indifferent measures - e.g. 100 cents constitutes 1 dollar -, or ratios, or degrees. In this last determination of measure, namely in the degree, one quality internally transforms itself into another. So, for instance, the transition of water from solid to liquid (which is caused by, but not is, the rise of temperature) can be repeated for the already liquified water, until the liquid itself evaporates, thereby becoming steam. Here, the one change which gave birth to the liquid is also its death. Or, to take another example, a grain of sand becomes a heap by being piled together one by one. However, a heap once more becomes a multiplicity of grains by being made bigger and bigger - a beach is not a humungous heap, but is something altogether different. However, in intensifying itself and thus losing itself in its other, quality at the same time posits itself as virtually present in this other. So, for example, a beach is implicitly also a heap, and steam is implicitly also liquid. This posited, virtual quality is no longer subject to measure: no matter how far water or sand develops, the determinations of liquid and heap remain the same. This virtual quality, which emerges as a result of the dialectic of measure taken to its conclusion, is what Hegel calls the "measureless." This "measureless" is essence, while the being which continues to be as the explicit manifestation of this essence is shine.
Thus, the essence of the immediately existing steam is the solid, the liquid, and the steam. Shine always is a measure, while essence is necessarily a measureless, virtual quality.
How does this logical process explain the birth of semblance? Well, it shows what a semblance is. A semblance is not an "emergent property." Rather, it is being which has posited the virtual, negated quality which has been and yet is not, due to the nature of measure. To put it another way, when measurable qualities exist as something which came out of its implicit existence, these qualities are semblances. However, what the ordinary consciousness fails to see is that the semblance-ness of these measurable quantities are posited just because of the nature of the measure. It is false to think that pre-existing essences posit themselves as finite, subjecting themselves to being measured by someone external. It is rather the essences which are posited by the movement of measure.