All Changes Are in the Desire, Not in the Light
“There is no change in the Light.” Rather, all the changes are in the Kelim, meaning in our senses. We measure everything according to our imagination. From this it follows that if many people examine one spiritual object, each will attain according to his imagination and senses, thereby seeing a different form.
In addition, the form itself will change in a person according to his ups and downs, as we have said above that the Light is simple Light and all the changes are only in the receivers.
– Baal HaSulam, Shamati (I Heard) No. 3, “The Matter of Spiritual Attainment”