I love this! How creative and thoughtful.
It’s a typography experiment by a designer in New York City named Tien-Min Liao. She took it up herself to play around with the relationship, more specifically the transition, between uppercase and lowercase letters by painting her hands with black ink and changing her gestures to make the letterforms. It’s a fun and interesting way to study different elements of the letterforms.
Here’s a glimpse at what she’s created.
I definitely recommend you go to Tien-Min’s website to see the project in its entirety, including a video where the letterforms come to life.