Muji Blackboard Globe
This blackboard globe from Japanese "no frills" retailer Muji has serious appeal. It's the perfect kind of this to leave out when your less prurient friends come over and see what kind of strange worlds they create.
It's only £7 online, or if you're a New Yorker, you can wait for Muji's Soho store to open November 16th and hope they carry it.
Catalog Page [Muji.eu via Swissmiss via Core77]

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It would be nice if they gave some indication of its size. Baseball? Basketball? I can't tell from the picture.
Or people could make their own blackboard globe using a cheap regular globe and spray-on blackboard paint.
Why not leave it out for your more prurient friends, as well? I'd bet that their continents have more peninsulas.
cheers Joel,
That's my travel agent brother's Christmas bought.
The only place I'd seen a chalkboard globe mentioned before was in a description of an 18th or 19th century math classroom, for use in teaching spherical trigonometry. Very cool find!