Photo by Nathan Dumlao on Unsplash

It used to be when you went to a restaurant and ordered a drink it was poured and given to you. I can remember the first time I ordered a drink and was given an empty cup and invited to fill it myself at the soda fountain. I went up and began filling the cup from the spigot, watching the dark liquid rise higher and higher in the cup. I stopped as it got close to the surface. And then when I saw that it was about an inch from the surface I thought, but maybe I could fill it a little more (these in the ancient…