During the Industrial Revolution, the rising importance of machinery caused workers to see their jobs more as dull tasks and less as rewarding careers.
Before mechanization, more workers were skilled artisans. They did things like weaving cloth or making shoes. Their work was something of an art. After mechanization, many of these people had to do work that was not skilled. All they really did was to look after the machines. They were not respected by their bosses because they were just unskilled bodies who could easily be replaced. Because of these things, they saw their jobs as unpleasant drudgery. This helped lead to much of the labor unrest during the Industrial Revolution.