Interesting, but maybe I'm jumping too much at this: a number of the object photos lack reference lengths for scale, are taken on wooden desks, floors, etc. Is

Interesting, but maybe I'm jumping too much at this: a number of the object photos lack reference lengths for scale, are taken on wooden desks, floors, etc. Is this common? If I were taking such forensic photos, I'd want reference lengths in every picture, on a simple gridded plane, rather than whatever surface seems to be handy.