A section of a grid on a surface such as a floor or wall.
Time-flow control is at the heart of Verse programming language, and is accomplished with concurrent expressions.
Time flow is a type of flow control, but where control flow is about the order in which a computer executes instructions based on the order of expressions in the program, time flow controls the execution in time, not sequence, based on how concurrency expressions are used.
Time flow is another way of saying concurrency.