On The Capsum

The capsum is a container of species held by each spellform, sometimes denoted as a stack. The capsum stores species in the order in which they are inserted, keeping a ‘head’ corresponding to the last species inserted into the capsum. This is important as all reading and writing operates on the head.

As such, practitioners may

think of the capsum as a deck of cards, where spells may stack cards up, but can only interact with the very top of the deck. Much of the correct functioning of spellforms depends on practitioners arranging for the order of species in the capsum to provide the correct species for each instruction in the cursorium.

All modifications to that capsum are driven by the demands of instructions, which

may execute either ‘push’ or ‘pop’ operations. Species may be stored through ‘pushing’, where a pushed species is made into the head of the capsum. Conversely, species may be retrieved by ‘popping’, where the head of the capsum is removed and fed into the instruction that popped it.