Rupert has developed his own method of painting with egg tempera, often on a large scale, preparing pigments and gessoed panels by hand. His recent series of water paintings has evolved into a more abstract and suggestive form, inspired by the river he walks daily. These works capture the rapidly shifting light at dawn and dusk, portraying landscapes with long shadows, sometimes melancholic, sometimes up-lifting. Colour is reduced to tonal shifts, and the compositions suggest a deeper sense of movement and undercurrents in nature.