Technically, no. I've always viewed a living astral form as having its own sort of light, which can 'bleed' around the edges of other things, akin to light which you can see coming out of a room, through the cracks in the door and that sort of thing. A powerful magic's aura/signature will similarly bleed past, around, and through objects, to be visible on the other side of the wall, in the room next door, and so on - it's why you might get uneasy before you ever open a door to a terrible scene.