Why these are separate. The courses are held to a standard: every chapter reviewed, every exercise auto-graded, every claim demonstrated. The lab is where things go before they earn that, or when they were never meant to be a course at all.
The lab
Pages that are not part of any course: commissioned work, prototypes, and ideas being tested in public. They are rougher than the courses on purpose — some are finished, some are half-finished, and the half-finished ones are labelled.
Why these are separate. The courses are held to a standard: every chapter reviewed, every exercise auto-graded, every claim demonstrated. The lab is where things go before they earn that, or when they were never meant to be a course at all.