In the physical world design affordances vary from the implict to explicit. In the virtual it’s all has to be implied with references to known cues.
Record. Speed. On/Off. Button. Twist. Turn. Click.
Think about how ‘pull to refresh, pinch or swipe’ are now mapped onto our lexicon of usage. The most common virtual affordances thankfully maintain physical references. Think of it as the compass for our perceptual understanding.