Once upon a time, there was a primary school teacher. She had seen Otto DIY robot, and she was working to build one and take it to her students.
Then she needed to find a way to make Otto easier to program, because her students are too young to learn C and C++. So, she asked for help among the Facebook community of Otto builders. She found Hien Phan, a Vietnamese engineer, who created the mBlock extension.
For Christmas Camilo Parra Palacio, Otto's father, arranged a contest, so the teacher decided to take part in it with her students and try to win another robot together.
The teacher and her students thought that the comet would be happy to meet the tree, so they coded both robots and made the story come true.