Two types of cells. One type defines functions. Another are instances of those functions that require inputs. Arrange them in click n drag floaty space. Cells of type one exist in a name space. Cells of type two exist in spacey space.

This kind of thing exists at a larger scale for pipeline visualization. I could see it working for notebooks.

> Notebooks are very much based on linear order and side-effects

Try https://beta.observablehq.com/