There are 4 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 (1, 5)
Distance from target shape to pink square at (4, 3): 5
Distance from target shape to yellow right_triangle at (3, 4): 3
Distance from target shape to blue square at (2, 6): 2
Closest shape is the blue square at (2, 6) with distance 2</think>

<answer>(2, 6)</answer>