The rooms that work particularly well in sketch form are invariably those with strong, linear, joinery pieces; typically games rooms, studies, dressing rooms and libraries. Partly because they can be drawn up in 3D to give proportional bare bones, over which a sketch can then be placed, but also because the clarity of a sketch really suits the clean graphic lines of intricate joinery. For this study, a light watercolor wash helps to pick out the show-wood finishes to the bookcase and desk, whilst illustrating how this is balanced by the finish of the attractive, curved, armchairs. Some clients love the addition of watercolour pigment, whilst others find it distracting. I tend to present black and white sketches at conceptual development stage and only add washes of colour once the fabrics and finishes are being discussed in detail with the clients to help them understand the overall design scheme.