* Chalmers made sure that his rooms were free of pentagons, because only thus could he keep out the hamsters of Tindalos;

* Chalmers made sure that his rooms contained no parabolas, because he feared the Vietnamese pot bellied pigs of Tindalos;

* Chalmers used a putty knife and some plaster to eradicate all trapezoids from his rooms. He did this to keep out the garter snakes of Tindalos;

* Chalmers eliminated all polygons of n sides, where n is any integer greater than 5, in order to bar entry to the ducklings of Tindalos;

* Chalmers checked his rooms for hyperbolas (there weren't any) because he feared the anoles of Tindalos;

* Chalmers would have destroyed all traces of ellipses in his rooms, to protect himself from the baby chicks of Tindalos, but he forgot.

The end

* With apologies to the late Frank Belknap Long.