These are typically the very first two publications for the "Modern-dayý Pračlovek" series (Modern Caveman). The primary idea was to represent caveman drawings within a very simple way and products which have been employed at that time... but also inside our times. The main just one — “Kuchyňa Pračloveka” (Caveman's https://maplepublishers.com/blog/popular-self-publishing-trends-of-this-year/