In pictures: South African innovators

The Afri-can guitar was first made by engineer Graeme Wells in 2001 using five-litre oil cans and bottle tops.

He spent many years experimenting with the oil-can guitar concept, developed from the "Rampie" - a long-necked lute with fine strings and tuning pegs - first used in the Cape area in the 18th and 19th centuries.