Towel day: 'Hitchhiker' author Douglas Adams remembered

Arnaud De Grave (aka hern42), Denmark Photograph: Renzo Akkerman Photograph: guardian.co.uk Emily Davis , Falmouth, Cornwall, UK Photograph: Emily Davis Karl Gunnarsson , dressed as Arthur Dent, just outside of Reykjavík, Iceland Photograph: Karl Gunnarsson Photograph: guardian.co.uk Keith Bloomfield , West Midlands, UK Photograph: Keith Bloomfield Photograph: guardian.co.uk Nicolas M , Aix, Provence-Alpes-Cote d'Azur, France Photograph: Nicolas M Photograph: guardian.co.uk Michael D Dunn Greensboro, North Carolina, USA Photograph: Michael D. Dunn Photograph: guardian.co.uk Stefan Rahm (Blacklsz), Bavaria Photograph: Stefan Rahm Photograph: guardian.co.uk Simone Petralia (Sim Dawdler), Catania, Sicily Photograph: Simone Petralia Photograph: guardian.co.uk Jenny Ortuoste , Manila, Philippines Photograph: Jenny Ortuoste Photograph: guardian.co.uk