Mona Lisa and coffee

The first thing that comes to my mind when I saw this photo is how they manage to do it. My guess is they already work it out using a computer and calculated the numbers of coffee cup required and the specific color of the coffee. Next is just prepared and arrange the coffee cup accordingly. The difficult part is how accurate you are able to follow the blue print. It is actually a work of art using coffee to create the Mona Lisa. I don’t suppose the coffee will taste good. Most of the coffee will be too cold to drink. At the end the coffee is good for a look but not for drink. A lot of milk is used for the white color.