These are the very first two publications with the "Fashionableý Pračlovek" sequence (Fashionable Caveman). The key strategy was to depict caveman drawings in the very simple way and products which have been used At the moment... but will also within our days. The first 1 — “Kuchyňa Pračloveka” (Caveman's Kitchen) https://maplepublishers.com/blog/popular-self-publishing-trends-of-this-year/