The end of the road behind
The step from the cliff above and behind
The swirling of smoke and no fire left
The bottom of the whirlpool twisting from sight
The emptiness after the slap, before the welt outswells
The end game of every philosophy: ab nihilo, entre nihilo
The logical declension through insanity to catatonia
Thought leading to the nth degree without the subsequent, "Oh!"

Critical thought without foundations
Building without bedrock
Runaway locomotive, off the tracks
Leaving home without good-bye and no way back