The visual information provides information about the development of cutting instruments in two different periods. The year difference between the two tools shown is 0.6 million years.
There has been a significant change in the body structure between the two cutting instruments. The size of Tool B is way larger than Tool B when both are being compared. Although the height of the instrument remains unchanged, the width of Tool B has become thinner than Tool A over the years. In addition, it is not hard to notice that the surface of Tool B is smoother than Tool A, which is more convenient and effective for people who lived at that time to cut stuff. The edges of Tool B are blunter than Tool A which lowers the opportunities of people getting hand peeling or injuries when they use the tool.
As time passes, the intelligence of human beings has improved to make their lives better.