The problem presented in this article is of significant importance in the philosophical debate on the individual. Its ambiguity and multidimensional character keep provoking new questions. The “between” plane has numerous implications in both the individual sense and the social sense. Approached from the perspective of the constitution of an interpersonal relationship, the plane points to the problem of freedom, responsibility, and reciprocality. Therefore, the aim of these analyses is to answer the question of the status, role and function of “between” in the interpersonal relationship and reference plane. Martin Buber presents “between” in the primal coil of the relationship of beings. Józef Tischner places them in the centre of the philosophy of drama, which always unfolds between a certain I and Thou. Finally, Hanna Arendt complements their analyses with the indication of the importance of community‑forming, which is possible in the public sphere thanks to the idea of “between”. The analysis of the three philosophical perspectives allows to formulate a thesis, in which the “between” plane plays a key role in realizing the specific nature of a relationship, reveals its core but also brings out the subjective I and Thou even more.