Reading computer manuals without the hardware is as frustrating as reading manuals without the software.

The line plays on the mismatch between abstract instruction and practical experience. Clarke suggests that technical documentation is most meaningful when paired with the thing it describes; without the ability to try steps, see outputs, and correct mistakes, manuals become inert and irritating. The joke also points to a broader theme in Clarke’s writing: technology is best understood through interaction, not mere description. Read as a critique of overly theoretical or poorly contextualized documentation, it implies that learning is embodied and iterative—especially in computing, where hardware and software form an interdependent system and neither makes full sense in isolation.