There are 6 shapes on a 4x4 grid. Which shape is closest to the purple trapezoid 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 trapezoid at (2, 3)
Distance from target shape to brown square at (1, 0): 4
Distance from target shape to blue rectangle at (0, 2): 3
Distance from target shape to green square at (1, 2): 2
Distance from target shape to orange rectangle at (1, 3): 1
Distance from target shape to red square at (0, 3): 2
Closest shape is the orange rectangle at (1, 3) with distance 1</think>

<answer>(1, 3)</answer>