Other historians critique the anachronisms present in reenactment and cite the impossibility of truly retrieving and reproducing the past from the vantage point of the present; "We are not past but present people, with experience, knowledge, feelings, and aims previously unknown," writes Lowenthal, and however impeccably we attempt to bring back the past, everything is filtered through our modern lens and senses. Further, others worry that the focus on historical accuracy in the details, such as dress, obscure the broader historical themes that are critical for audiences to understand; this worry is more acute for certain forms of reenactment, such as U.S. Civil War reenactment, that elicit strong feelings and have real impacts in the present-day world. By focusing on the accuracy of details, some worry, the discussion of the war's causes, such as the end of slavery, are confined to the margins.