Slippery sign

The sign itself was not slippery, it merely indicates the quality of slipperiness. (Which concept --- slipperiness --- indeed often arises in discussions between the sign and the signified!)

Wordlessly evocative.

This post's theme word is arenicolous, "living, growing, or burrowing in sand." The arenicolous ants were at first baffled by the glissant gel coating the floor.