A mechanical engineer or student can understand how a mechanism or machine works from an image, but developing this skill requires dedicated study and practice. Key subjects include machine design, mechanisms, and technical drawing, with recommended resources like Shigley’s books and the "Mechanisms and Mechanical Devices Sourcebook" by Neil Sclater. Hands-on experience, such as disassembling mechanical devices, enhances understanding of how parts function together. Engaging with educational tools like Meccano or Lego can also be beneficial. Familiarity with these concepts and practical applications will improve the ability to visualize mechanisms from drawings.