To take the world as the seat of the ultimately determining instance means to view it as the embracing nexus of causes extended out and in as far as imagination can go, informed by every kind of persuasive knowledge. That's the world inside the world you want to see as beautiful in itself, as beautiful in mere being, as the only sustainer of beauty. The phenomenal is always tainted by something imaginary so to go beyond that to mere being you have to integrate mind and world, the seeing and the seen, the knowing and the known. Allow the phenomenal to melt into dreaming and then allow the dreaming, now completely weightless and infinitely insubstantial, to re-become the world reconciled to appearance. As if you have ever so delicately filleted your reality, opened it up and removed the bones and then sealed it up again, and behold, it has finally and fully become itself - the bones, of all the hidden and transcendent parts that made it up were what was most you, were the purest life of the mind surrendered, of the seer, as of course, they could only ever have been.