Must be a defining trait - A "cyborg" is loosely and deliberately defined here as a being with both "biological or organic" parts and "artificial or synthetic" parts, regardless of either source being "natural" or a "fabrication[disambiguation needed]". This definition is not perfect and requires some "common sense" to be applied. For instance, the definition would seem to allow humans with a prosthesis to be considered "cyborgs" but this seems inappropriate (see Category:Fictional amputees). Furthermore, distinction between primarily robotic organism or primarily organic organism being is not made, neither is a beings' life-dependency on either organics or synthetics to function properly is made, nor is distinction made between a being whose intelligence and/or sentience is organic-based or synthetic-based. The differences between the two frequently becomes more "philosophical" than "physical", as are often the case with fictional cyborgs when dealing with the boundary between "human" and "machine".