the light can enter through the window, even using the surface of the glass table but if it is not reflected in the leg of the table you will not get the reflection of the image, apart you discovered that it was a metal leg of the table, which the reflection was on a wooden floor and the leg was the same as the one that comes out hidden in the photo, there I see many things, now analyze if the image in your house is closer to that response than to the girl who uses the source of the image the glass and says it is reflected in a door (I think that answer is farther away)