There are 6 shapes on a 6x6 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 (1, 5)
Distance from target shape to yellow right_triangle at (5, 1): 8
Distance from target shape to red right_triangle at (0, 2): 4
Distance from target shape to gray rectangle at (2, 3): 3
Distance from target shape to cyan rectangle at (5, 5): 4
Distance from target shape to brown right_triangle at (3, 2): 5
Closest shape is the gray rectangle at (2, 3) with distance 3</think>

<answer>(2, 3)</answer>