In the case of solid figures a more difficult geometrical abstraction is involved.
The abstraction keeps moving forward, and the technology races to keep up.
This, again, is a process of abstraction, the attainment of abstract ideas which, apart from the concrete individuals, are conceived as having a substantive existence.
By this theory, Hume is freed from all the problems of abstraction and judgment.
Berkeley, though at length the notions of spirits, acts and relations 6 give him pause, prefers the formula which Hume expresses in the phrase that " some ideas are particular in their nature but general in their representation," 7 and the afterhistory of " abstraction " is a discussion of the conditions under which one idea " stands for " a group. Not from those for whom general ideas mean schematic concepts, not imageable.