Since Mercedes-Benz offered the first car sunroof in 1932, the ways in which automakers have sought to let the sun shine into the cabin have become increasingly complex. More recently, we've seen the emergence of two, three and four-part retractable hard-tops (RHT). With a little help from Webasto, VW has pushed back the boundaries by offering a five-part RHT. Matthew Beecham lifts the lid of the VW Eos, named after the Greek goddess of dawn and wind