The Lightbox

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I've been using a lightbox for the past forty years or so.  How it works is this: the light shines up through the rough drawing (on fairly thin paper) which I place underneath a blank piece of watercolour paper.  I can see the rough shape of the drawing under the paper - but not too clearly.  So I don't trace the drawing, but it does help me to know how the picture is composed; and I can retain an air of spontaneity, of 'doing it for the first time' no matter how many goes I have at any particular drawing.