There are 5 shapes on a 4x4 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, 2)
Distance from target shape to orange rectangle at (0, 3): 3
Distance from target shape to gray rectangle at (1, 1): 2
Distance from target shape to yellow right_triangle at (0, 2): 2
Distance from target shape to blue trapezoid at (3, 0): 3
Closest shape is the gray rectangle at (1, 1) with distance 2</think>

<answer>(1, 1)</answer>