A concept is a construction, a development in the mind composed of connected experiences or perceptions and associated vocabulary. These connected pieces, like tinker toys, may be quiet simple or very elaborate. And like tinker toys, there are a many relatively right ways to fit the pieces together, many ways to map the parts and their relationships.
Our conceptual constructions may be too simplistic and undeveloped or they may be too complex, unwieldy and divorced from observation. The reason is that our experiences and thoughts about particular concepts are limited and we may not have done much to correct that, having not found the inspiration to do so.