Most visual programming is two-dimensional. What if it were three-dimensional instead, arranged in some sort of https://en.wikipedia.org/wiki/Axonometric_projection with https://en.wikipedia.org/wiki/Platonic_solid 's representing your modules/nodes, chosen according to the amount of connections they have with other modules/nodes, the connections styled and color coded, maybe even unobtrusive/discreetly animated to show the direction/speed/volume of signals/dataflow, width of datatypes/buses, all in an abstract fashion similar to the way large metro/rapid-transit systems are mapped?

Able to encapsulate other modules/nodes, folding large graphs into one, popping into an https://en.wikipedia.org/wiki/Exploded-view_drawing only on demand?

Turnable/viewable from any direction you like, but usually snapping to some virtual 3D-grid, in say steps of 45° ?

Zoomable?

This is even usable the other way around for reasoning about stuff you have NO source code for. Like in https://www.youtube.com/watch?v=4bM3Gut1hIk (skip to about 14m30sec, the show starts there) and https://sites.google.com/site/xxcantorxdustxx (same guy) and others, but similar https://codisec.com/binary-data-visualization and even more so https://arcan-fe.com

That looks messy, but that is because it is in reverse, with no known sources.

Now imagine how tidy it could look when done originally, from first principles.

Your own cybernetic Zettelkasten/Memex/Dynabook/whatever in a world of common and open (architecture neutral) data & document formats, automagically tagging, indexing and sorting all your stuff.

OFFLINE if you like to.

Usable on conventional desktops, tablets, large surfaces, overlaid onto some augmented reality, VR, holographics, i don't care.

With the end goal of partially dynamic reconfiguration/JIT of some fpga-like logic fabric, according to what you click, tap, swipe in that environment, while hosting itself.

Without crashing. Formally verified at the same time.