A white cloud on left is one through which infinite existence too is visible apart from that cloud itself.

A mystic is one who is available to us in body from and he has achieved the destiny to be one with existence. So to his disciples he is both ie finite expression as body and infinite like blue sky in space. A faint white cloud at left is exact depiction of a mystic. It is a cloud in a form state but infinite blue sky too is visible in it, for those (disciples) who has capacity or surrendered to master.