The Seven of Coins is Earth (wealth, the physical world, skills, pragmatic endeavors) related to the element Air (knowledge, reason, logic). It oftentimes signifies the work associated with learning, by study, tutor, or by experimentation and the scientific method.
Experimentation in particular is important, because education is essentially pushing into the unknown, and making the expanse of the unknown retreat through one's work. There is always going to be some experimentation involved, even if that experimentation amounts to textbooks and scratch paper. Attempting new things, and acquiring practical knowledge for that experimentation, is very close to the essence of this card.
Additionally, the Seven of Coins may represent an assessment of work done, or of any pragmatic or material matter. For example, it may be a structural assessment of a building, a health inspection at a restaurant, or a sanity check of a software application in development.
Because of the element Air's association with decision making, education, experimentation, or assessment leading up to a decision is especially relevant.
The Abstract Seven of Coins is abstract Earth (pragmatism, skill, conventional thinking) related to the element Air (knowledge, concepts, mind). It either signifies mastery of a skill, or perfectionism, or both.
If it signifies the mastery of a skill, it is likely the kind of mastery that allows one to do something with ease and to be recognized as an expert. It may not entail the kind of artistry, or the wow factor, embodied in The Vector. This achieving what is expected to be considered an expert of any skill, and not necessarily much else. In particular, this card may represent the "getting there" aspect of mastery.
Perfectionism may add to one's ability to achieve mastery in any field, but it also might detract from the ability to think outside the box because . Perfectionism can decrease one's ability to focus on things apart from their obsessions, and it can cause significant stress.