A concept is considered complex and convoluted. There should be open cavities at either end to allow room for the next persons thoughts. Concepts are private, sometimes public and most often fluid in a society that always seems to be changing its collective mind about things. Some examples of a political concepts are ethics, honesty, crime and punishment. Social strata are a collective rule of behavior for all to follow and be judged against.
Religious concepts lead followers into and out of daily deep emotional needs.
Personal sacrifice means to be something more than just an animal on this earth. A mechanical concept is something which we count on, like gravity, the planetary movements, climatic changes that can be measured and gears that can turn. The great industrial revolution was a flourish of mechanical concepts and development in how things work and what machines could do to improve our lives. Public concepts that are shared, advertised and politicized are our new churches. We support concepts and icons and become followers of economy or progress.