These (Kant’s) ideas say, among other things, that the form of the world we experience, its actual geometry and its actual temporality, is the way it is because of the way our self-consciousness is as rational, formally intelligible and universalistic in both form and content. Presumably, on Kant’s program, if our rationality were to change in the right way, the world itself would come to have different properties. I believe this is a testable proposition.
Carl H. Flygt, Conversation. A New Theory of Language