Sense Sonnet - Pumper

 My Shell I Tell

Sea mollusk, nautilus, I be

Especially proud of my shell,

Strong, pressure resistant 'round me,

Multi chambered in which I dwell.

Dark top, hard to see from above,

Giving it a dark water blend.

But shell bottom camouflaged of

White, a surface water pretend.

So threats from above or below

Most often don't become aware,

Since to them as water I show,

Go their way, leaving me safe there.

But if attacked I can retreat

Inside my shell and close it neat.