There are 4 shapes on a 4x4 grid. Which shape is closest to the green square in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: green square at (0, 0)
Distance from target shape to purple rectangle at (1, 3): 4
Distance from target shape to pink trapezoid at (1, 1): 2
Distance from target shape to orange trapezoid at (2, 1): 3
Closest shape is the pink trapezoid at (1, 1) with distance 2</think>

<answer>(1, 1)</answer>