The books penned by him are well known all over the world, although they were not so popular during Lovecraft's life. The main theme of his creativity is the Cthulhu Mythos. Lovecraft created an entire fictional world; his tales are even classified into a subgenre known as Lovecraftian horror. The tales The Call of Cthulhu, The Color Out of Space, Dagon and others are among the most famous works of Howard Lovecraft.