These are typically the first two publications for the "Contemporaryý Pračlovek" series (Present day Caveman). The principle idea was to characterize caveman drawings in a very very simple way and items that were utilised at that time... and also within our days. The main one — “Kuchyňa Pračloveka” (Caveman's Kitchen) https://maplepublishers.com/blog/why-opt-for-self-publishing-is-it-only-for-creative-independence-or-something-more/