The creative task you choose must be repeated in some form every day.
Every iteration must be documented in some form. (As a record of your daily effort).
The medium is open.
We encourage you to share and upload to the site throughout the 100 days. This project is a rewarding, demanding creative marathon of sorts, so it helps to share with others and be part of the community! Remember to take each day as it comes, keep it simple, enjoy the process...good luck!