There are 6 shapes on a 6x6 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 (3, 5)
Distance from target shape to brown right_triangle at (0, 5): 3
Distance from target shape to orange square at (0, 0): 8
Distance from target shape to gray square at (0, 4): 4
Distance from target shape to green square at (2, 2): 4
Distance from target shape to pink trapezoid at (4, 0): 6
Closest shape is the brown right_triangle at (0, 5) with distance 3</think>

<answer>(0, 5)</answer>