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 (2, 4)
Distance from target shape to green right_triangle at (1, 4): 1
Distance from target shape to yellow rectangle at (1, 1): 4
Distance from target shape to orange trapezoid at (0, 5): 3
Distance from target shape to purple rectangle at (4, 1): 5
Closest shape is the green right_triangle at (1, 4) with distance 1</think>

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