The ever-present thought.

Sneaking, teasing, lingering.

Subtle, yet persistent.

Always seems to find a way, that little hole in the wall. It's passing through, as light and formless as air, it's gripping every inch of the wall, easing its way through. Always finding its way past.

Once in a while you'll be stupid enough to be over-conscious of that little spot it occupies, and suddenly the subtlety is gone.

You thought, there it goes, it's coming back, but it's always been there, you know.