Yesterday, it was the winter solstice (
touji in Japanese). On this day, all the
sento (public baths) in Kyoto put bags of
yuzu fruit (a kind of sweet Japanese citrus, somewhere between a grapefruit and a mandarin orange). This is supposed to help you deal with the cold of winter. (On the summer solstice, they put bundles of a plant called
shobu, which looks something like rhubarb).
Here's the sign outside my local sento advertising the event:

Here's the entrance to my local sento:

Here's a picture of the bag of
yuzu in one of the baths (needless to say, the lens of my camera fogged up as soon as I entered the bath area). I like to get in the tub and sqeeze them so the juice comes out into the water - it smells great). When I got home, my wife threw a
yuzu fruit into our home tub so that our son Kieran could enjoy a
yuzu bath: