รายละเอียดตัวอย่าง

The diagram illustrates the transformation of Stone Age cutting tools from 1.4 million to 0.8 million years ago. Overall, both appearances of cutting tools over time had the same features, with sharp points at their tops and hard materials that were mostly made of rock. In addition, over 0.6 million years, cutting tools became more sophisticated and complex while still maintained its old shape. From 1.4 million years ago, the appearance of those tools look quite simple and hard to manage. Front view did not include the right balance between two sides, making its layout did not stay organized. Moving on the side view, its sharpness seemed to be terrible within unnecessary several angels. The most balance view was when people looking from its back; however generally, its size quite small, with 5cm. Moving to 0.8 years ago, most views became more complex, from size, balance to sharpness. At this time, cutting tools already be managed, regarding to its layout. Sharp point at the top was included, increasing its length to 10cm. Side view had improved its sharpness due to the age's technique. Creating a completely balance when looking from the back view.