They are the primary two publications for the "Moderný Pračlovek" sequence (Contemporary Caveman). The main concept was to signify caveman drawings within a quite simple way and products that ended up employed at that time... but also inside our times. The first just one — “Kuchyňa Pračloveka” (Caveman's Kitchen area) https://maplepublishers.com/blog/how-can-you-become-a-thriving-author-while-book-self-publishing-london/