Swiss mailboxes

When you enter the main entrance to our building you're standing with a battery of mailboxes on either side. The colour is the for the Swiss postal service so classical yellow and the design is characterised by the eighties' partiality for cubism and staggered levels. Notice also that unlike most American mailboxes there's a small slot through which the mail is deposited while one needs a key to open the door and retrieve the mail. We still haven't figured out what the slightly larger, unlocked room below each mailbox is for.