Watercolours
If I were stranded on a desert island I think it would be my watercolours above all other media that I would want with me. From sketching to highly considered finished paintings, watercolour can cope with it all. It may not have the same prestige as oil paint, and certainly not it's permanency, but the qualities it does have, it's intimacy, it's beautiful subtlety and it's versatility, as well as being so totally unforgiving in it's use, make it a challenging but completely rewarding medium and I love it.