There are 6 shapes on a 7x7 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 (6, 6)
Distance from target shape to blue square at (6, 1): 5
Distance from target shape to orange right_triangle at (4, 6): 2
Distance from target shape to cyan rectangle at (5, 4): 3
Distance from target shape to pink square at (1, 6): 5
Distance from target shape to purple rectangle at (0, 0): 12
Closest shape is the orange right_triangle at (4, 6) with distance 2</think>

<answer>(4, 6)</answer>