The text discusses the problem of realism and idealism in modern philosophy and focuses on the existence of material objects as an essential point in this debate. The author mentions the philosophies of Husserl and Ingarden, who both argue that there is a paradox in attempting to prove the existence of the external world. The text also mentions the concept of existence in ontology and the ongoing discussion about realism versus idealism. Finally, the author talks about the relevance of these debates in contemporary times and the failure of existentialism in reconciling subjectivity and objectivity.