I have seen similar pictures a long time ago. Is this photography or post PS?

First, find a large enough water tank, then put a tripod on one side, set the SLR to manual mode and manual color temperature mode (to prevent the color tone and exposure of the two pictures from being different), and then take two pictures: one is wearing slippers now, as shown in the reflection, and the other is just visiting slippers at the water tank (be sure to put them in the same position as when you are standing when putting on shoes). Then enter PS, open two layers of the two pictures respectively, and then remove the foot wearing shoes with a mask. that's it ...