Let the Window at which a Painter works, have a Sash of oil'd Paper before it, without any Bars running a cross the Sash; these Bars being of no use, but to shut out part of the Light, and to project Shadows, which may give him some trouble in the Execution of his Work. It will be of use likewise, to tinge the extreme parts of the Sash, with some obscure Colour; making it fall off gradually, as it advances from the extremities of the Sash: so that the Bounds of the Light, may not be the same with those of the Window.