The Society for Gestalt Theory and its Applications (GTA) is celebrating its 40th anniversary this year. The task of this article was to give a selection of gestalt theoretical research, which was created within the framework of the GTA. After a brief introduction to the theory, recent developments that have emerged since the founding of the Society and have found expression in the journal Gestalt Theory, as well as in many other publications, have been discussed. A number of contributions to the fundamental area could be cited: consciousness research, multifield approach, synergetics, language, development, and so on. The transfer of basic knowledge to a number of application-oriented disciplines, namely, psychotherapy, education, arts, culture, nation and society, organizations, and so on, has been presented. The article has shown that Gestalt theory has great relevance in both basic and application-related areas and can cover a wide range of issues.