There are 5 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, 3)
Distance from target shape to cyan square at (7, 7): 9
Distance from target shape to gray rectangle at (6, 8): 9
Distance from target shape to brown trapezoid at (3, 6): 4
Distance from target shape to purple trapezoid at (1, 3): 1
Closest shape is the purple trapezoid at (1, 3) with distance 1</think>

<answer>(1, 3)</answer>