These are generally the very first two publications for that "Present dayý Pračlovek" sequence (Contemporary Caveman). The key strategy was to represent caveman drawings in the very simple way and items that were being used at that time... but also inside our days. The first a person — “Kuchyňa Pračloveka” https://maplepublishers.com/blog/why-opt-for-self-publishing-is-it-only-for-creative-independence-or-something-more/