Okay. Well, I must have mixed the chocolate rather well with a spoon (and had a lot of chocolate powder in the water) - to make it bubbly, and the lighting and enlargement help to make the bubbles look so prominent. The diameter of the cup the chocolate is in is 8 cm (3.15").
Thank you. Well I do like Atget (and Man Ray), and try to adhere to Minor White's advice One should not only photograph things for what they are but for what else they are. :)

