There’s a fabulous documentary about the Welsh painter Kyffin Williams currently on BBC iPlayer.
Discussing his prolific landscapes painted up in the mountains of north Wales he describes how for the first 25-30 years of his painting career he would lug paints and canvas up the mountains to capture nature as it lay before him, but then he started to take sketchbooks and watercolours instead because he wanted to use his studio as the place where he could use the sketches to
interpret the landscape, and not record it….