In ‘Lhen (Watermill)’ Knox has painted the mill buildings and wheel as blocks of colour against a pale sky. The white buildings, bathed in pink rosy hues, represent the warm glow of a summer sunset. The feeling of calm tranquillity is further suggested by two white doves flying serenely in front of the mill.

Most of Knox’s watercolours are unsigned and give no indication of date or title or even where on the Island they were painted. This is an unusual work in being titled and dated, ‘Lhen VI 1904’.

Knox appears to have produced his watercolour paintings as a series of artistic studies, attempting to capture the changing qualities of light and its effect on the landscape. The traditional artistic maxim that one should practice one’s artistic craft every day appears to be one that Knox adhered to as he constantly refined and perfected his watercolour technique.