This seemingly simple mirrored wall creates a visually intriguing "infinity room" effect, a common architectural trick that uses opposing reflective surfaces to create the illusion of an endlessly receding space. While often used in art installations or themed attractions, finding such a pronounced example in an everyday space like an airport terminal restroom can be quite unexpected and amusing. It transformed what would otherwise be a mundane washroom into a momentary optical illusion. You can observe similar illusions in various places, from art museums to funhouses, and even in some elevator designs. The effect is achieved when parallel mirrors face each other, reflecting images back and forth an infinite number of times, with each reflection slightly dimmer and smaller than the last due to light absorption. This specific mirror setup in the Istanbul Airport terminal likely utilizes two or more large mirrors positioned across from each other, coupled with the lighting fixtures, to enhance this sense of depth. On the right side of the mirror, you can see a universal "no smoking" sign, indicating that this is a smoke-free zone, a standard regulation in most public buildings and certainly airports worldwide. Below it appears to be a paper towel dispenser, and above it, a coat hook, items typical of a public restroom.