Through repeated use, a tool can cease to be experienced primarily as an external object requiring conscious manipulation. Its possibilities and limitations become incorporated into bodily practice. The body learns how far it can reach through the tool, what kinds of movements it permits, and how the surrounding world can be encountered through it. Merleau-Ponty describes how, when the body’s existing capacities are insufficient for an intended action, it can construct an instrument through which those capacities are reorganised.

The lettering guide provides a simple example. At first, its edge appears as an external restriction: my hand cannot move wherever it wants. Yet through use, that same edge becomes something through which my hand knows how to move. The constraint is no longer simply encountered as an obstacle outside the body; it becomes part of the conditions through which the gesture is performed. I perceive and act through the constraint rather than merely against it.

The lettering guide makes this surprisingly concrete. Before my hand reaches it, neither the gesture nor the resulting letter is completely determined. The guide offers certain movements and prevents others. My hand applies pressure, changes direction, hesitates, follows or resists. What appears on the paper emerges through this encounter. The possibilities do not belong entirely to my hand, and they do not belong entirely to the tool.

This is also why I have become cautious about describing flesh simply as my experience of the world. Bryan E. Bannon’s reading of Merleau-Ponty helped clarify this for me. He argues that flesh should not be reduced to lived perceptual experience, but understood through a body’s relational engagement with its milieu. What matters is not only what I experience internally, but the field of relations through which both body and world acquire particular possibilities.