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  Introduction Abstract concepts play crucial roles in shaping our understanding of complex systems. Noam Chomsky’s “empty categories” in syntax and the “invisible characters” in text processing are two such constructs that, though emerging from distinct fields—linguistics and computer science—share surprising similarities. Both challenge conventional notions of visibility , presence and being , revealing how unseen elements can fundamentally structure language and text. Chomsky’s empty categories, such as traces and PRO, are theoretical constructs that account for syntactic phenomena not directly observable in spoken or written language. These silent elements are essential for explaining deep syntactic structures and the universal principles that govern grammar. Similarly, in computer science, invisible characters, including newline characters and spaces, are critical for text formatting and data processing, even though they remain hidden from view. These parallels res...

  L'essentiel est invisible pour les yeux : On ne voit bien qu'avec le cœur . Antoine de Saint-Exupéry Introduction The concept of the "invisible letter" in computer science introduces a fascinating dimension to our understanding of textual data processing. These characters, though devoid of visual representation when displayed or printed, wield significant influence over the structure and formatting of text. Despite their imperceptibility to the naked eye, these characters challenge conventional notions of presence and being, particularly within the context of Western philosophy. In philosophical discourse, "presence" typically connotes observable existence; however, the presence of these invisible characters underscores the importance of the unseen aspects in shaping meaning and structure. This confrontation with metaphysical assumptions regarding existence and significance prompts a reevaluation of the nature of presence and being, extending the dis...