One way mirrors don't really exist, what calls itself a one-way mirror is just something relying on the difference in light levels between inside and out.
No, I just went for a wee up against a window I thought had blackout film on it but was actually a window of a restaurant full of horrified diners and children (Won't somebody think of the children!) looking at my tiny knob.
One way mirrors don't really exist, what calls itself a one-way mirror is just something relying on the difference in light levels between inside and out.