Headline: Optics and EssenceLink: https://cross-currents.com/2018/06/09/optics-and-essence/Publication Date: Saturday, June 9, 2018Primary Source: Cross-currentsNon-Cato Author: Avi ShafranType: new media postFormat: New MediaNature of Mention: citedScholar: CatoResearch Area: Immigration and Labor MarketsSubjects: immigration