When one object is closer than a second, it partially blocks one's view of the second object, which then appears more distant than the first. This is a monocular depth cue called:

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Interposition, also known as occlusion, occurs when an object is partially blocked by another object. This can create a sense of depth and distance, as the blocked object is perceived as being farther away than the blocking object. The other options, relative size, linear perspective, and retinal disparity, are all other monocular depth cues but do not specifically involve blocking of one object by another.

When One Object Is Closer Than a Second, It Partially