When you blow soap bubbles how come there is always something that looks like a window reflected on it?

Question

Always a square or rectangular reflection of a window with frames around the panes as all. Why is that?

Answer 1

I wasn't a science major but it has something to do with the infraction of light through water in the air.

Answer 2

Because the window is the brightest thing in the area and the bubble has two reflective surfaces, inside and out, it is almost certain to reflect an image of a window from someplace. If you blow bubbles outdoors or in a room without windows, you won't see it.