There are 5 shapes on a 7x7 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 (6, 0)
Distance from target shape to green right_triangle at (4, 0): 2
Distance from target shape to red square at (0, 1): 7
Distance from target shape to orange square at (1, 3): 8
Distance from target shape to gray right_triangle at (0, 0): 6
Closest shape is the green right_triangle at (4, 0) with distance 2</think>

<answer>(4, 0)</answer>