There are 4 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 (6, 6)
Distance from target shape to pink rectangle at (7, 0): 7
Distance from target shape to gray square at (1, 0): 11
Distance from target shape to red trapezoid at (0, 4): 8
Closest shape is the pink rectangle at (7, 0) with distance 7</think>

<answer>(7, 0)</answer>