There are 6 shapes on a 6x6 grid. Which shape is closest to the purple right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: purple right_triangle at (0, 0)
Distance from target shape to blue right_triangle at (1, 1): 2
Distance from target shape to gray trapezoid at (2, 4): 6
Distance from target shape to brown right_triangle at (1, 3): 4
Distance from target shape to cyan square at (2, 1): 3
Distance from target shape to red square at (0, 1): 1
Closest shape is the red square at (0, 1) with distance 1</think>

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