I wouldn't sail this ship if I were you
0800 Lost things
-0800.1 Recently lost
–0800.23 Mittens
—0800.231 Mittens placed on walls, railings and gates by helpful passers-by
–0800.24 Stuffed bears, dogs and bunnies
—0800.241 Those that are found again, to great joy
—0800.242 Those that are not
—-0800.2422 Those that are lost in airports at the start of a long journey
—0800.243 Those that might have been found again, or might have been replaced by a duplicate, you are never quite sure
–0800.25 Things that you know you put down just a moment ago
—0800.251 Items that are in fact still on your person somewhere and obvious to a hypothetical bystander
—0800.252 Items which you need to find to be able to find them
—-0800.2521 Glasses
—-0800.2522 Cups of coffee
-0800.2 Long lost
–0800.21 The subject of intense nostalgia
—0800.211 Things for which the nostalgia does not align with the original reality
—0800.212 The subject of sepia-tinted documentaries
–0800.27 Things after the death of the last person who remembers them directly
–0800.28 Things after the death of the last person who has heard the truth of them
–0800.29 Things that have passed even out of story and rumour
-0800.3 Things that are not lost, but know perfectly well where they are
–0800.31 Things that are hiding
–0800.32 Things that are mistaken about their location
—0800.323 Confident walkers in mazes
-0800.4 Things under sofa cushions
–0800.41 Remote controls, keys and pens
–0800.42 Food, dust and buttons
–0800.43 Other sundry items
–0800.44 Things that have passed into the main body of the sofa
—0800.444 Things that are so valuable they require the dismantling of the sofa to retrieve
-0800.5 That are the subject of humorous asides
–0800.51 Marbles
—0800.511 Literal marbles
–0800.52 Virginity
—0800.523 May or may not be lost, depending on whether a specific act counts or not
-0800.6 Appetites, desires and dreams
-0800.7 Cities, civilisations, treasure, ships, aeroplanes, etc.
–0800.72 That in fact never existed in the first place
–0800.73 Rumoured location is covered in dense jungle
–0800.74 Rumoured location is under the sea
-0800.8 Memories
–0800.81 Of which only a ghost remains
—0800.811 Memories that itch maddeningly at your thoughts when you smell a particular smell
—0800.812 Things that you know you once knew
—0800.813 Things that other people know you once knew