His illustrations during this period have now become collectors ' items , including Jack McDevitt 's Nebula Award - winning Seeker .
Harris continued to specialise in large - scale commissions for companies such as Philips Electronics and Shell , .
Harris ' illustrations during this period have now become collectors ' items , including Jack McDevitt 's Nebula Award - winning Seeker .
Harris continued to specialise in large - scale commissions for companies such as Philips Electronics and Shell , .