We (the humans) were a little tired after just signing the insides of 75 cards— we can only imagine how exhausted the WaterColorBot must have been after painting the fronts and insides! They were actually painted in three passes: for the inside “Thank you” text, for the light-blue (extra-wet) background on the front, and for the flower subject on the front.
Of course, the real magic of robotics is that it is so reproducible, card after card. And yet, the real magic of watercolor as a medium is that it isn’t completely reproducible. Look at the subtle little variations caused by the amount of water either in the light blue background or in the flower subject. We see the same kinds of “organic” variation that we might expect from a human artist. Simply wonderful.