A short summer reflection: I've never thought about looking through a cup of espresso, or lungo, or americano, until this holiday. To my surprise the lungo is not always homogeneous (it shouldn't have been, however).
At the house we are exchanging for this summer, in the middle of Paris :), there is a Nespresso machine. At home, we have an rather ordinary/mainstream espresso machine, whereas Nespresso claims to give you a good cup of espresso or lungo without all the hassle: insert one of the many varieties of ready made coffe capsules, press the button, and you get a good(?) cup of espresso without the need for grinding, cleaning etc.