In the previous post, I had mentioned the inverted napkin. Now, see the glass of lemon water and the bowl of soup. I was using the mobile phone version of the vOICe and even without a headset, I was able to tell that the soup bowl was shallower than the glass and I suspect larger in diameter though I did not think about the diameter at that time. Also have a play with the color filters. The lemon water is yellow and the soup is green.

lemonWater

soupBowl