Create a pixel art image in a lofi style, representing the concept of 'Business Administration' (BWL). The artwork should feature a single, clean, and simple object such as a retro-style calculator, a stack of papers, or a minimalist office desk. The background should be plain black for a sleek and modern look, emphasizing the object. Use soft, muted colors and minimal details to maintain the lofi aesthetic, ensuring the image feels calm and focused.