Prompt: what I figured to be one of those ink stain things psychiatrists in films always use, from Feath's Bookcase's Muse Teasers daily drabble idea.

Psychiatrist's ink stain

I am the psychiatrist's ink stain. I am what you see in me; a faceless non-person without its own identity. A chameleon and a sponge, I echo everything I touch. I could be anyone, I could be no one. I could be you. But I'll never be myself. Make off me what you will, project your images on my blankness; I'll be your mirror, a 2D imitation of reality. I am the psychiatrist's ink stain, a reflection of what's wrong with the world, with your mind and your desires. I am what you see in me, so close your eyes.