There are 6 shapes on a 8x8 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 (6, 0)
Distance from target shape to purple trapezoid at (5, 3): 4
Distance from target shape to cyan right_triangle at (0, 1): 7
Distance from target shape to pink rectangle at (6, 6): 6
Distance from target shape to orange square at (1, 3): 8
Distance from target shape to yellow right_triangle at (4, 0): 2
Closest shape is the yellow right_triangle at (4, 0) with distance 2</think>

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