There are 4 shapes on a 8x8 grid. Which shape is closest to the pink 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: pink rectangle at (2, 1)
Distance from target shape to yellow square at (4, 7): 8
Distance from target shape to blue trapezoid at (5, 6): 8
Distance from target shape to purple square at (6, 5): 8
Closest shape is the yellow square at (4, 7) with distance 8</think>

<answer>(4, 7)</answer>