Reflecting Figure 1 over a vertical line will result in a figure that maintains the same height but has its base and vertices shifted horizontally to the opposite side of the vertical line of reflection. Given that Figure 1 is oriented with the base along the 4th row and spans from the 4th to the 5th column, reflecting it vertically will place the base starting from the 3rd column and ending at the 2nd column.
Considering the options provided (Figure 1, Figure 2, Figure 3, Figure 4) and their orientations based on the descriptions, the reflection of Figure 1 would convert it to a shape like Figure 2.
Therefore, the answer is:
Figure 2.