"Near it" is not definite, but for the time being, let us allow it to stand up-stage near the stool and bench, but a little toward Center. Next, you "look away to your left, where you can see another window." The direction here is not practicable, but the window may well go above the fireplace, instead of below, thus:
Underneath this window stands a writing table and a chair:
"Next the writing table, towards the door, is a leather covered sofa." To add another article of furniture to this already crowded side of the stage would not only make the room appear unnatural to the audience, but would render it impossible for the actors to move about with ease. The director will therefore have to use his ingenuity and judgment as to where to put the sofa. Some subsequent "business" may necessitate a change of the disposition of more than one chair or sofa or stool, but the process here outlined is the first step. To proceed: the sofa, then, must be placed somewhere else. But where? By moving the drill to the left, in the corner, the sofa can be placed next to the table, as follows:
"The opposite wall, close on your right, is occupied mostly by a bookcase. The operating chair is under your nose, facing you, with the cabinet of instruments handy to it on your left."
It is at once observed how necessary it was to move the drill from the other side of the room to this: over by the table, it would be out of convenient reach of the dentist.