The introduction to Julian Spalding´s website will give you a 3 minute brief on some of his ideas. There is however a more comprehensive presentation on the iai Academy website. Although it only allows you free viewing for 20 minutes a month those 20 minutes of Julian Spalding´s presentation are a revelation. He unmasks conceptual art for what it is. If you want to sign up to watch the full 45 minutes you may want to read their privacy policy first.