There are 6 shapes on a 6x6 grid. Which shape is closest to the blue 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: blue square at (3, 0)
Distance from target shape to yellow square at (0, 0): 3
Distance from target shape to green right_triangle at (3, 5): 5
Distance from target shape to pink rectangle at (1, 3): 5
Distance from target shape to cyan square at (5, 3): 5
Distance from target shape to purple right_triangle at (1, 0): 2
Closest shape is the purple right_triangle at (1, 0) with distance 2</think>

<answer>(1, 0)</answer>