object mesoscopic physical object physical object of mesoscopic geological size This is a legacy class from ENVO's early versions. It will be depopulated and filled in by inference using a PATO quality. Not to be confused with "mesoscopic" as defined in physics, which deals with objects typically between 10e-6 and 10-8 meters in diameter. mesoscopic physical object An environmental feature that is, or can be, contained and is predominantly composed of one or a few types of stuff. An object which is large enough to be visible to humans, but small enough that humans can handle the object (i.e. transport it, examine it, etc) in its entirety with little to no technological assistance. environmental feature