 it absolutely would not follow from the representation of [e.g.] space, a representation that serves a priori, with all the various properties of space, as foundation for the geometer, that all of this, together with what is deduced from it, must be exactly so in nature. The space of the geometer would [or could] be taken for mere fabrication and credited with no objective validity, because it is simply not to be seen how things would have to agree necessarily with the image that we form of them by ourselves and in advance. (§13, Note I, 4:287)