This quote emphasizes the crucial distinction between affordances and signifiers in the realm of design. Affordances refer to the inherent qualities of an object that suggest how it can be used—such as a button's shape inviting pressing or a door handle indicating it should be pulled. Signifiers, on the other hand, are explicit signals or cues that alert users to where and how to interact with these affordances. They serve as visual or perceptible indicators, guiding users intuitively toward completing their tasks without the need for external instructions. In designing intuitive interfaces and objects, it's often the signifiers that play a more critical role because users rely heavily on perceptible cues to understand how to interact. When signifiers are clear and well-placed, they reduce user frustration, prevent errors, and create a seamless experience. Conversely, poor signifiers can render even well-designed affordances unnoticed, rendering those affordances useless. This distinction underscores the importance of thoughtful signaling in user experience design, which can significantly influence usability and overall satisfaction. The quote highlights that effective design must prioritize perceptible signals—signifiers—to ensure that users can effortlessly discover and utilize functionalities, ultimately fostering a more intuitive and efficient interaction.

(The Design of Everyday Things) - Donald A. Norman