You know those crime investigation walls they use in TV detective/mystery programs?
You know the ones where they pin and tape and tack sticky noted up on a wall and connect then with pins and string to solve a mystery? They seem to be all over the place now.
Does anyone know if anyone really does this, or is it just a thing they do in TV and movies to lay things out for the viewer?
If it is a real thing, do you know how they work? What is the procedure for setting one up and what are the rules for using it?