Hashi-oki {chopstick rests} have been used at homes for many decades.
And there are
hashi-oki in various forms. Some are items of traditional craft, and some are items mass-produced in a factory.
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http://www.google.com/search?num=10&hl=en&site=imghp&tbm=isch&source=h...where do you place your chopsticks while you're not using them? I seldom place chopsticks on the table. When I am without
hashi-oki, I place them on a whole-meal tray, a rice / soup bowl, a vegetable dish or so.
When a meal is served on a molded metal / plastic tray where every food item can be settled, as in some school cafeteria, I can place chopsticks on the tray and do without
hashi-oki.
In the past when I was using my plastic lunchbox, I usually brought my chopsticks in a plastic
hashi-bako {chopstick case}; I was without
hashi-oki so I placed my chopsticks on the lunchbox during the meal, and after that I settled them is the case.
I understand chopstick rests are only used in fancy dinners and restaurants. You think so maybe because Japanese people you already know do not use a chopstick rest for a usual meal at home.
By the way, "chopsticks" literary means
wari-bashi. However, as maybe you know, most reusable chopsticks are a pair of separate sticks, not what we chop into two sticks. Although "chopsticks" is not adequate as a general term, it has come to mean oriental food-picking sticks, due to historical and cultural backgrounds.
I would like to see other bento boxes with triangular divisions. Can you help me find photos of some other examples in the web? Are they very uncommon? I think they are common to some extent, but it seems not easy to set good Japanese keywords in searching for their photos on the web, partly because a division in a bento box does not have a steady name in Japanese.
: An old seasonal
eki-ben item around Tokyo (Jan. - Mar. 2010) using a box with triangle and rectangular divisions.
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http://www.ekiben.or.jp/daimasu/type/makunochi/2010/01/001273.html(Above it on the webpage you see another box with two triangle divisions.)
: An
eki-ben item of Niigata Station (Nov. 2011 - ) using a box with non-rectangular quadrilateral divisions.
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http://www.ekiben.or.jp/nigatasanshin/new_releases/2011/12/001563.html