These are typically the initial two publications with the "Moderný Pračlovek" collection (Modern-day Caveman). The main notion was to characterize caveman drawings in a very simple way and items that were used At the moment... but in addition inside our times. The first 1 — “Kuchyňa Pračloveka” (Caveman's Kitchen area) https://maplepublishers.com/blog/how-to-become-a-good-childrens-book-writer/