Question

Are there limits to human/devices perception?

Answer 1

As far as i know, measurement devices present measurements based on something that affects the device's particles, for instance, forces, heat, tension, voltage...  My question is, given that every change of position of any particle may affect the particles of the measurement device, why cant we design devices that can distinguish between any state of the universe?  Consider for instance our human body. If i have a car behind a Wall, i cannot distinguish this situation from one where there isn't a car behind the Wall, since i only see the Wall. Still, having a car behind the Wall surely affects something in our particles, maybe the gravity pull from the car, or some change in the overall environment light, or even a change in the trajectory of the light that arrives in our eyes (since we perceive light), even if the effect is minimal.  Is there some law that limits measument and devices so that we cannot have a device that can distinguish from every state of the universe

Answer 2

There are no limits to the perceptions beyond the limits of the sensors: vision, hearing etc. Usually when a complex matter is approached, the human looks naturally for simplifications: a model that captures the essence of the observed chaos. This model is then tested for validity. This is done in a similar way by both by the scientist studying a data set as the b2b sales rep trying to understand the clients needs from his facial expressions and expressions. A simplified hyphothesis model is proposed and then validated. The simplified model also has the benefit that it can be discussed and explained easily by a group of humans.