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 (2, 1)
Distance from target shape to red rectangle at (0, 1): 2
Distance from target shape to green trapezoid at (1, 1): 1
Distance from target shape to blue trapezoid at (2, 2): 1
Closest shape is the green trapezoid at (1, 1) with distance 1</think>

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