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

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