They are the first two publications for that "Present dayý Pračlovek" sequence (Present day Caveman). The principle notion was to represent caveman drawings within a very simple way and products that were utilized at that time... but also in our times. The main one particular — “Kuchyňa Pračloveka” (Caveman's Kitchen https://maplepublishers.com/blog/services-authors-receive-from-self-book-publishers-in-london/