a doctor in a white coat explains a complex medical procedure using technical diagrams and charts. The patient, an ordinary person in casual clothes, looks completely confused with a puzzled expression and scratches their head. The doctor points confidently at detailed medical illustrations while speaking. The patient nods politely but clearly doesn't understand any of the specialized terminology being used. A nurse nearby observes the communication gap between the medical professional and the regular person. The patient's confused facial expression shows they lack the specialized knowledge to follow the explanation. a person without professional or specialized knowledge in a particular subject