Logos and icons are a powerful tool for universal communication because they can transcend language barriers and communicate a message through unspoken graphic imagery. Humans have been communicating this way for thousands of years. Today, simple graphical icons link computers to humans globally :-) Take a brief second to realize all of icons that exist on your GUI (Graphical User Interface) desktop computer. The icons on your smart phone were once charcoal cave prints...I've seen Apples's logo etched in an ancient cave in Tulum.