Full Idea
We reach radical perspectivism by replacing Kant's single, necessary categorial scheme with a plurality of competing categorial schemes.
Clarification
'Perspectivism' refers to Nietzsche relativist epistemological views
Gist of Idea
Radical perspectivism replaces Kant's necessary scheme with many different schemes
Source
Robert Fogelin (Walking the Tightrope of Reason [2003], Ch.3)
Book Reference
Fogelin,Robert: 'Walking the Tightrope of Reason' [OUP 2004], p.80
A Reaction
It certainly looks as if Kant sent us down a slippery slope into the dafter aspects of twentieth century relativism. The best antidote I know of is Davidson's (e.g. Idea 6398). But then it seems unimaginative to say that only one scheme is possible.
Related Idea
Idea 6398 Different points of view make sense, but they must be plotted on a common background [Davidson]