There are 5 shapes on a 6x6 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 (4, 0)
Distance from target shape to pink rectangle at (4, 1): 1
Distance from target shape to red right_triangle at (3, 5): 6
Distance from target shape to orange right_triangle at (2, 4): 6
Distance from target shape to green rectangle at (3, 4): 5
Closest shape is the pink rectangle at (4, 1) with distance 1</think>

<answer>(4, 1)</answer>