Actually given the diversity the recipe doesn't really matter as no one characteristic is definable.
What, however, with the idealists was an object of thought alone, the absolute, is to Lotze only inadequately definable in rigorous philosophical language; the aspirations of the human heart, the contents of our feelings and desires, the aims of art and the tenets of religious faith must be grasped in order to fill the empty idea of the absolute with meaning.
A solid angle is definable as the space contained by three or more planes intersecting in a common point; it is familiarly represented by a corner.
It does not follow, however, that the attempt to distinguish special races should be given up, for there at least exist several definable types, each of which so far prevails in a certain population as to be taken as its standard.
These accessories carry with them a sense of refinement, though there is no definable reason as to why.