There are 4 shapes on a 9x9 grid. Which shape is closest to the purple 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: purple square at (4, 0)
Distance from target shape to gray trapezoid at (1, 6): 9
Distance from target shape to yellow square at (8, 6): 10
Distance from target shape to blue trapezoid at (1, 5): 8
Closest shape is the blue trapezoid at (1, 5) with distance 8</think>

<answer>(1, 5)</answer>