Kant felt compelled for moral reasons to postulate the existence of a noumenal realm in establishing our "dignity" as autonomous beings. The issue to be addressed in this instance concerns the influence his practical philosophy had in motivating the critical project as a whole, with Ryall arguing that Kant's appeal to the noumenal realm in legitimizing our "Supersensible" interests did not follow his epistemological reversal but preceded it, contributing to its "idealistic" character from the beginning. In order to "make room for faith," that is to say (B xxx), it was necessary for Kant to deny the absolute physical reality of Copernican theory which, on the assumption that this does hold, makes entirely unwarranted the postulation of all things supernatural, i.e., "God, freedom and immortality."