"Create a detailed black, white, and gray illustration explaining Chapter 1 of the book 'Vertriebskunst: Der geheime Code des Verkaufserfolgs.' This chapter covers the fundamentals of sales. The illustration should include the following elements: Historical Development of Sales: A timeline showcasing the evolution of sales from ancient barter systems, through medieval markets, the industrial revolution, and the digital age. Each era should be visually represented with typical sales scenes. Definition and Importance of Sales: A section explaining what sales are and why they are crucial for businesses. This part should highlight key concepts like revenue generation, brand building, customer retention, and competitive advantage. Key Traits of a Successful Salesperson: Icons or representations of communication, persuasion, product knowledge, adaptability, and goal orientation. Each trait should be clearly labeled with readable text. First Steps in the Sales Process: A flowchart illustrating the initial steps in sales, including preparation, identifying leads, initial contact, and understanding customer needs. The illustration should be clear, professional, and use high-contrast to ensure readability. Text should be in a clean, legible font."