There are 6 shapes on a 8x8 grid. Which shape is closest to the brown 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: brown square at (2, 4)
Distance from target shape to green right_triangle at (0, 1): 5
Distance from target shape to pink square at (1, 0): 5
Distance from target shape to cyan square at (4, 1): 5
Distance from target shape to blue rectangle at (1, 3): 2
Distance from target shape to orange square at (3, 6): 3
Closest shape is the blue rectangle at (1, 3) with distance 2</think>

<answer>(1, 3)</answer>