This book deals with many sub-areas of Philosophy, and it was made to help philosophy undergraduate students and interested people. Your shelf on cryptovoxels will have real content with this philosophical literature. You can download the IRL version for free at: https://wp.ufpel.edu.br/nepfil/files/2021/01/pf_sdf.pdf. Support free academic knowledge, the virtualization of reality, and the continous work of The Philosopher.