During , Lotus introduced a car with an aluminium-sheet monocoque chassis instead of the traditional space-frame design. This proved to be the greatest technological breakthrough since the introduction of mid-engined cars. During , Rhodesian duo John Love and Sam Tingle were the first to run cigarette sponsorship on their cars, which ran in orange, brown and gold Team Gunston colours in the South African Grand Prix on 1 January 1968, five months before Lotus painted an Imperial Tobacco livery on their cars, thus introducing sponsorship to the sport.