Photo credit: E. Michael Smith Chiefio
It looks like they are getting ready to fill the four growlers of the people on the right side ;)
This piece is indicative of a whole world of such minatures that can be found in museums with ancient culture collections. They're fun to look at, some are amazingly well done, and many show a terrific sense of humor.
I like the fact that someone took the time to do something like this; it also means people had time to settle down and create enjoyable objects such as this. These miniatures were found in tombs, ostensibly to help the deceased pass time in the afterlife, in this case by enjoying a fresh beer!* I was trying to find the exact reason why top-fermenting yeast floats and bottom-fermenting yeast sinks. I was able to find one claim that ale yeast has a water-repellent coating that makes it float, but no specific explanation of the opposite case. The information I found was descriptive (it floats/sinks) rather than explanatory (it floats/sinks because...).