There are 4 shapes on a 3x3 grid. Which shape is closest to the brown rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: brown rectangle at (1, 2)
Distance from target shape to blue rectangle at (0, 0): 3
Distance from target shape to pink rectangle at (2, 1): 2
Distance from target shape to purple trapezoid at (0, 1): 2
Closest shape is the pink rectangle at (2, 1) with distance 2</think>

<answer>(2, 1)</answer>