These are definitely the initial two publications for the "Modern-dayý Pračlovek" collection (Contemporary Caveman). The leading idea was to signify caveman drawings in the very simple way and products which had been applied at that time... but also within our times. The very first 1 — “Kuchyňa Pračloveka” (Caveman's Kitchen https://maplepublishers.com/blog/4-essential-tips-to-pick-the-right-self-publishing-agency/