Spectral lines: Our circles of concern

One´s powers of observation need not be excessively keen to notice that each person and every institution tends to develop its own ¿circles of concern¿ regarding specific topics. Although such circles of concern are often geographic in nature, rarely are they literally circles. Sometime they are time-related, in which case they might better be likened to an antenna pattern, one lobe extending backward into history and the other forward into the future.