The text is referring to the above painting and reads:
The most striking object in this painting is the tall pasglas, a special beer glass which was part of a drinking game popular in the 17th century. When it was your turn, you had to drink just to the next ring -- no simple task for someone who had already had a few. If you missed that ring, you had to keep going until you the next one.
Sounds awesome! Where can we buy one of those glasses? We'd love to hear how you would update it (if at all)!