Accordingly the subjects of the prophetic vision do not necessarily appear in the same way as the corresponding physical objects would appear to the physical eye. What is seen by the soul is a shining light that is understood as a circle (igul) if what is seen is “circular”, or as a straight line (yosher) if what is seen in the vision is “straight”. The same applies to all the other forms or images seen by the soul: it is not that the physical form itself is seen.
Part 2: Even the spiritual form that is seen is not of the intrinsic essence of the Sefirot themselves... For the creations are of two kinds, physical and spiritual, and each have their own respective forms. But the Supreme Glory does not intrinsically possess either of these two kinds of forms. It may, however, appear through such forms, though not in a physical form, which is gross, but in a spiritual form, which is fine and subtle. It “appears” or is “seen” in the same way that thoughts “appear” or are “seen” in the mind.