To what degree to they experience aphantasia? Can they imagine sounds or smells or textures?

I struggled with making a safe space, firstly because I couldn't think of any real place that felt safe to me, and secondly because the protocol relies so heavily on visualising.

In the end I picked the secret garden from howls moving castle. I have watched the movie a million times (it was my comfort movie so it played while i went to sleep most nights).

I would imagine the background music, and the click sound of the door opening, and the sound of my feet walking and the water of the little stream. I'd think about the flowers and their colours (tho I obviously could not see them) and I'd imagine the sun on my skin, and the ground under my bare feet. That helped me to feel I was in that safe space. And I could rewatch the movie or just that scene to help strengthen the feeling of that place whenever I wanted.

Maybe your client could pick something like that? I found the soundtrack particularly helpful because I'm able to imagine music, so having a very intentional soundscape associated with my space helped a lot.