There are 6 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 (4, 2)
Distance from target shape to blue trapezoid at (7, 6): 7
Distance from target shape to cyan square at (5, 0): 3
Distance from target shape to yellow rectangle at (3, 3): 2
Distance from target shape to orange square at (0, 6): 8
Distance from target shape to red trapezoid at (3, 5): 4
Closest shape is the yellow rectangle at (3, 3) with distance 2</think>

<answer>(3, 3)</answer>