Puzzle piece

Words
54
Reading
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8y

Here is a poem that needs an explanation:

The set up of tension
The moon, two dogs
And the crab rising
Not knowing when to sting
To attach the clamps
To look back
Through the doors
Getting a glimpse.
The frog at our feet
Jumps to greet us
Yet our fear
Keeps us here.

Puzzle piece | Ecency