Proximity as Perception: An Ultrasonic Sensor as a Spatial Sensory Organ for General-Purpose Computing, and the Perceptual Wave Function as its Mathematical Processor

General-purpose computers receive signals through discrete and encoded channels: keyboard, microphone, camera, WiFi, Bluetooth. None of them continuously perceive the physical space surrounding them. This is not a technical limitation — it is a design assumption so widespread that it is rarely questioned. This work poses a different question: what happens when a computer is given a spatial sense it was never designed for? The PWF Physical Probe is an invitation before it is a report. It uses an HC-SR04 sensor, a three-dollar microcontroller, and a common computer to run the formalism of the Panperceptual Theory of the Universe (PTU) on the real physical world. Anyone can replicate it with what they have at home. The instrument operates in two layers. The first is computational: the formalism runs on synthetic signals derived from the scientific literature. The second is physical confirmation: the same formalism applied to real sensor data. The convergence between layers is not the final result — it is the starting point for those who wish to go further. This is a first step of the PTU formalism into the physical world. The formalism now has a place to run. And that place can be built in an afternoon.