Mathematician staring at a whiteboard covered in graphs

{
  "input": {
    "prompt": " Photo of a university-style office/classroom with a large whiteboard filled with cleanly drawn graphs: a 45° line (y=x), a parabola (y=x²), a square-root curve, a flat line at y=0, tan(x) with vertical asymptotes, and cos(x) as a wave. A professor (gender not specified; could be Dr. Helena Frasch stand-in) holds a marker mid-gesture, looking tired-but-composed, conveying “reluctant internet translator.” No real university branding."
  }
}