But wasn't the room, in both cases, lit in a particular way? Well, this question, as it stands, is senseless, and so is the answer, “It was … ” The order, “Observe the particular lighting of this room”, does not imply any statement about the appearance of this room. It seemed to say: “This room has a particular lighting, which I need not name; observe it!” The lighting referred to, it seems, is given by a sample, and you are to make use of the sample; as you would be doing in copying the precise shade of a colour sample on a palette. Whereas the order is similar to this: “Get hold of this sample!”