There are 6 shapes on a 10x10 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 (2, 1)
Distance from target shape to cyan right_triangle at (1, 2): 2
Distance from target shape to purple square at (9, 4): 10
Distance from target shape to green trapezoid at (0, 9): 10
Distance from target shape to pink right_triangle at (8, 3): 8
Distance from target shape to brown right_triangle at (1, 6): 6
Closest shape is the cyan right_triangle at (1, 2) with distance 2</think>

<answer>(1, 2)</answer>