A Mode is a cognitive context you have to put yourself in to do a particular task, for example, working on a command line with its peculiar syntax.

Switching between modes is taxing and error-prone; these attributes minimize switching and enhance fluidity in the workflow.

Notice Self-revealing in particular. This is the antithesis of coding, and you will see multiple examples in the videos to come. Instead of being required to enter a syntactically correct expression, you choose from alternatives that have been explained.