Section - Something to Sit On
The perch is a thing that varies.
To say Progue's perch:
now the perch is a random perchable setpiece in location;
if the perch is nothing begin;
if location of Progue is not pp-l begin;
now pp-l is location of Progue;
now pp-wd is "[one of]a rock[or]a boulder[or]the [surface-material][or]a log[at random]";
say "[the perch]";
pp-l is a room that varies. pp-wd is an indexed text that varies.