on cell

SketchSystems.spec

on cell
  far from junction
    enter junction -> inside junction
    hovered tile above -> north cell
    hovered tile to right -> east cell
  inside junction
    leave junction -> on cell
    
north cell
northeast cell
east cell

SketchSystems_prototype.js

function render(model){
  let current_state_name = model.active_states[0].name;
  return $("h1",
           {style: {color: "darkBlue"}},
           `The current state is: ${current_state_name}`);
}