There are 3 shapes on a 6x6 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 (2, 0)
Distance from target shape to blue rectangle at (4, 4): 6
Distance from target shape to brown square at (1, 5): 6
Closest shape is the blue rectangle at (4, 4) with distance 6</think>

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