Imagery and Emotional Depth in Poetry

Analyze the following lines from a poem that employs intricate imagery to explore themes of isolation and introspection:

In the attic's dim light, shadows linger,

Whispers of dust dance in forgotten corners,

Each breath a sigh, each moment a memory,

Trapped in silence, walls echo the heart.

What does the imagery in these lines most effectively convey about the speaker's emotional state?