Psychogeography is the study of how subtle interventions in a landscape reshape our perception, movement, and behavior in space.

Spatial Notation is the use of symbolic marks, objects, and boundaries to reshape the hidden behavioral geometry of a space.

It does not necessarily alter the physical structure of a landscape. Instead, it alters the instructions perceived within it.

A cone does not build a wall.

A line of paint does not create a boundary.

A survey flag does not physically prevent passage.

Yet each can cause people to stop, turn, avoid, enter, wait, or move along a particular path.

Spatial notation therefore operates between physical space and behavioral space: it modifies how a space is interpreted, and through interpretation, how it is occupied.

Existing Languages of Authority

Spatial notation borrows from established systems of spatial communication—visual languages that people have already learned to recognize as carrying rules, warnings, permissions, restrictions, or instructions.

Examples include:

* cones

* survey flags

* chalk

* paint

* stakes

* reflectors

* string

* trail blazes

* snow markers

* caution tape

* temporary fencing

* arrows

* directional signs

* parking markings

* construction markings

The meaning of the notation does not reside entirely in the object itself. It emerges from context, convention, placement, and recognition.

A single orange cone may mean little. Ten cones arranged across a path can become a prohibition.

The physical intervention remains minimal; the behavioral consequence can be significant.

Criteria for Successful Notation

A successful spatial notation should:

* Resemble an existing spatial convention

It should draw upon a visual language that people already understand.

* Imply a rule, permission, or restriction

The notation should suggest that something is allowed, prohibited, directed, temporary, dangerous, private, or significant.

* Produce an observable behavioral change

People should move differently because the notation exists.

* Require minimal alteration to the landscape

The intervention should modify perception and behavior rather than materially restructuring the environment.

* Remain legible without explanation. Ideally, the notation communicates its instruction through recognition rather than through explicit language.

* Exploit ambiguity: The most interesting notations may occupy the space between legitimate infrastructure and fabricated authority, creating uncertainty about whether a rule actually exists.

The Behavioral Geometry of Space

Every space contains a visible geometry—walls, paths, roads, entrances, obstacles—and a less visible behavioral geometry composed of expectations, permissions, prohibitions, habits, and social cues.

Spatial notation intervenes primarily in this second geometry.

It can make an open space feel closed.

It can make an ordinary path appear official.

It can make an arbitrary boundary feel necessary.

It can make an unfamiliar route appear intentional.

The notation does not necessarily change where a person can go. It changes where a person believes they can go.

In this sense, Spatial Notation is an investigation into how little physical intervention is required to produce a change in spatial behavior.