The word 互相 is formed by combining two independent characters, each carrying a core meaning related to reciprocity, to create a reinforced, composite idea. The character 互 originally depicted two interlocking hooks or tools, symbolizing mutual connection and interchange. It is combined with 相, which in its ancient form shows an eye (目) looking at a tree (木), representing mutual observation or facing one another. When joined, these two pictographic and conceptual elements merge to vividly express the abstract notion of "mutuality" or "reciprocity", where each part amplifies the other’s sense of a two-way, interactive relationship.