What is the idea behind an optical illusion of a room that goes on and on?

The idea behind an optical illusion of a room that goes on and on is based on the concept of forced perspective. Here are the steps explaining the concept:

1. Forced Perspective: This is a technique that employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is. It manipulates human visual perception through the use of scaled objects and the correlation between them and the vantage point of the spectator or camera.

2. Design of the Room: In the case of a room that seems to go on and on, the design of the room is crucial. The room is typically designed in a trapezoidal shape, which means the farthest wall of the room is much smaller than the entrance wall.

3. Positioning and Scaling: Objects within the room are positioned and scaled in a way that enhances the illusion. Objects closer to the observer are larger, while those farther away are smaller. This creates a false sense of depth and distance.

4. Lighting: Lighting can also play a significant role in creating this illusion. Shadows and light can be used to enhance the depth perception, making the room appear longer.

5. Viewing Angle: The illusion works best when viewed from a specific angle, usually the entrance of the room. From this point, due to the design and arrangement of objects, the room appears to extend much farther than it actually does.

6. Human Perception: Finally, the illusion capitalizes on the way humans perceive space and depth. Our brains are wired to interpret visual cues in a way that usually corresponds to normal conditions. When these cues are manipulated, our brains can be tricked into seeing something that isn't there.