The document discusses what makes a logo successful and memorable over long periods of time. It states that while some of the most recognizable logos may not have complex histories, they have stood out for decades or centuries through their recognition. A good logo is one that people instantly recognize and associate with a particular company, product, or service. Some of the most iconic logos, like those of Google and Pepsi, use simple designs incorporating only a few colors that nevertheless became historically memorable. For a logo to be effective, it needs to be colorful, eye-catching, and simple so that it can be easily remembered and grow association with its company over time.