Reactive effects
Stellogen uses "reactive effects" which are activated during the interaction between two rays using special head symbols.
For printing, an interaction between two rays %print is needed.
The interaction generates a substitution defining the ray to be displayed:
+%print(X); -%print("hello world\n").
This command displays hello world then an end of line symbol.
Running a constellation
When constellations produce an effect, a run command is available
to execute them:
run +%print(X); -%print("hello world\n").