Sake Vessels

You drink coffee out of a mug. When drinking wine, stemware is the norm. Beer usually comes in a tumbler of some sort. 
But with sake, there is no codified standard drinking vessel. There are many different forms in play. 

Here are a few examples: 

The masu (the wooden box pictured in the upper right) is a common vessel. This box was originally used to measure rice.  They were common and most everyone carried one on them (for buying and making rice at home); it was natural for people to use them as drinking vessels too. The traditional ones are wood, but some people feel that this interferes with the aromas and prefer lacquered, aroma-less boxes. 

Pottery is popular as well. 

Footed glassware is also widely used. 

Several sake vessels are white with dark blue markings on the bottom. This is for a practical reason: A sake that is meant to be clear (non-nigori) will sometimes turn cloudy if it has slightly spoiled. The white cups with the blue circles are often used by sake judges, and the blue circles help them to detect clarity imperfections in sake, and potentially determine if a sake has begun to spoil. 

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