The diagrams depict the historical tools over the period of 600,000 years (from 1.4 million years to 0.8 million ago.) Overall, it is readily apparent that the main and noticeable changes were made in the shape, sharpness, and length of the tools. In general, these factors were improved for hunting and foraging for food.
To begin with, the earliest implement does not have any particular shape, whereas more recent tool has a teardrop shape, to make the process of hunting easier. This is the shape that can be suitable for individuals’ hands, and make it more convenient. Next one thing, the instrument used 1.4 million years ago has no specific sharpness to any tool. It can be seen, that the relatively modern implement, the opposite, has a very acute tip.
The length of the tool 0.8 million years ago, compared to the first original tool, has become longer. It is noticeable, that its length is approximately 10 cm, whereas, the original tool is around 8 cm long. In addition, the width of a more recent tool has been thinner than the earlies, and smoother.