The tone of science fictionfilms is often a guide to the tone of the times the film was made: other worlds and species are viewed in turn as wonderful, terrifying, threatening, incomprehensible, and childishly benign.
... (1842)
System der Wissenschaft (1850)
Meine Reform der Hegelschen Philosophie (1852)
Wissenschaft der logischen Idee (1858-59), with a supplement (Epilegomena, ...