There are 6 shapes on a 6x6 grid. Which shape is closest to the gray 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: gray square at (1, 0)
Distance from target shape to cyan trapezoid at (1, 3): 3
Distance from target shape to orange right_triangle at (2, 1): 2
Distance from target shape to yellow right_triangle at (4, 3): 6
Distance from target shape to green square at (1, 4): 4
Distance from target shape to blue rectangle at (5, 5): 9
Closest shape is the orange right_triangle at (2, 1) with distance 2</think>

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