The tiny people were deftly building a house. Scott wished it would catch fire, so he could see the people put it out.
Flames licked up from the half-completed structure. The automatons, with a great deal of odd apparatus, extinguished the blaze.
It didn't take Scott long to catch on. But he was a little worried. The manikins would obey his thoughts. By the time he discovered that, he was frightened, and threw the cube from him.
Halfway up the bank, he reconsidered and returned.

Mimsy Were The Borogoves (1943)