antenna clouds communication day flag house houses mast nice Poland polish polish flag roof sky sunshine telecommunication weather Baltic bridge construction Copenhagen Denmark ferry longest Malmo Oresund Pomerania sea ship Sund sweden swinoujscie transport waves Africa biosphere continents countries earth ecology global globe green isolated map nature orbit planet space universe World art beliefs biblical christian colored colored glass coloured coloured glass communicate concepts convey depictions faith glass journey light religious shades stained glass stories symbols barred bars caution control danger do not do not enter forbidden impede locked notice pipes posted prevent prevented Restrict restricted restriction sign warning advice announcement cambodian communicating confusing declaration detail direction english informative informing language lettering message notification removal remove shoes signs temple translation words black black-on-white directional humor humorous humour indication lane laneway name nomenclature specific street-name street-sign unusual white antique bronze buzón cartas correo grey isolated object letter Letterbox mail mailbox metal object on white old on white Postbox Rococo slot white background attendance attendees audience information listeners listening meeting members observing participants participation people readiness ready seated seating seminar seminar audience sharing Speaker speaking taking notes visitors