Well in short, its quite an interesting read. Alot of the facts of the science that was known then, when the book was written, have been updated and ammended. Especially with the introduction of the quantam theory and its dynamics and also advancements in the field of astronomy. Nonetheless with all the advancement of the present day technology, we cant dispute the apparent existence of the four globes(which in my own opinion, might be trying to explain dimensions in space-time and maybe even parallel universes) mentioned with in the book. And it delves deeper into the realms of metaphysics, which ofcourse, some can argue to be purely fictional beliefs. But all in all its quite challenging and intriguing. I recommend you read it for urself to really grasp its amazing concepts.