Deconstruction is an approach to understanding the relationship between text and meaning. It was originated by the philosopher Jacques Derrida (1930–2004), who defined the term variously throughout his career. In its simplest form it can be regarded as a criticism of Platonism and the idea of true forms, or essences, which take precedence over appearances. Deconstruction instead places the emphasis on appearance, or suggests, at least, that essence is to be found in appearance. Derrida would say that the difference is "undecidable", in that it cannot be discerned in everyday experiences.