There are 5 shapes on a 8x8 grid. Which shape is closest to the purple 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: purple rectangle at (1, 5)
Distance from target shape to orange right_triangle at (2, 7): 3
Distance from target shape to pink trapezoid at (7, 2): 9
Distance from target shape to red right_triangle at (3, 4): 3
Distance from target shape to green square at (4, 0): 8
Closest shape is the orange right_triangle at (2, 7) with distance 3</think>

<answer>(2, 7)</answer>