The diagram depicts the enhancement of cutting eqipments in the Stone Age. In general, after around six million years, there was a great development witnessed, specifically in the front, the side as well as the back view of the tool.
What is the most striking data when looking at tool A, which is likely to be an original version of the cutlery, is the fact that tool 1.4 million years ago was noticeably made from stone. With the total height of approximately 10cm, the front view and the back view of the knife were a reversed variation of each other. Simultaneously, appreciating the tools from a side view could make it look thinner with a sharper top in comparison to the aforementioned views.
Similarly, tool reported 0.8 million years ago also followed the same structure. Nevertheless, considering the material of the knife, it saw a gradual difference as the tool looked more glowy when viewing from the front and the back, beautifying the equipment as a whole. Moreover, the side part became slighter with a completely intense top, minimizing the time for cutting products.