Is single context recording the only way?

[Marc Berger]

Not having any experience or knowledge of having ever dug a face down canvas on the floor my first effort would be to remove the canvas and label it 1. I would then take a picture and make a plan of the next context (2) that I considered to be on "top" and so proceed. I imagine that I would start to notice the direction in which the "paint" had been applied and this would lead to interesting theories in post ex as to whether the picture had been painted by a left handed person with their head pointing to the west and the feet to the south whilst laying on their back staring at the ceiling. Any way at some point I would come to a floor (3 ), the density of which was such as to stop the "painting" moving any closer to the centre of the earth. I don't see how other than by the device of cloud stratigraphy I could get out of the matrix 1,2,3. or suggest that 2 was applied upside down (which might make a 2 look like a 5).

Came across this but haven't got much beyond the title. http://www.assemblage.group.shef.ac.uk/4/4rxt.html