Short Answer 
Shadows are created when an object blocks light, resulting in a dark area and influencing our perception of shape and depth. They represent subtlety, becoming noticeable through their movements in light, and are most visible in daylight but vanish at night, highlighting their importance in understanding our surroundings.
Step 1: Understanding the Nature of Shadows
The concept of a shadow is tied to light and vision. It is an effect created when an object blocks light, resulting in a dark area on a surface. Unlike physical entities, shadows do not possess legs or wings, yet they can move and shift their positions according to the light source.
Step 2: The Metaphorical Presence of Shadows
Shadows often represent subtlety, as indicated by phrases like “you can hear my voice in silent things.” This means that while shadows may not be overtly noticeable, they become apparent through their movements and changes in different lighting conditions. Their presence can influence our perception without making any noise.
Step 3: The Visibility and Importance of Shadows
Shadows are most visible during the day when the sun is shining, as they follow the shape of objects. However, they vanish at night when there is no light to cast them. They serve a crucial role in helping us understand and perceive the shape and position of objects in our environment; without shadows, it would be challenging to gauge depth and form, even though shadows are not living beings themselves.