A question mark placed *exactly* on a base border

{
  "input": {
    "prompt": " In-game style image showing a player’s base boundary: left side is a neatly built wooden-and-stone home with fenced garden, right side is open grassland. A thin “border line” is implied with a row of contrasting blocks or a subtle line in the terrain, and directly on that exact line sits a small 3–5 block-tall question mark (e.g., made of yellow wool with a black outline). The base owner avatar stands on the private side staring at it, conveying annoyance; include a minimap-like UI element or faint coordinates to emphasize precision (but keep it generic)."
  }
}