One invention that allows you to see through walls is called a "thermal imaging camera." Thermal imaging cameras work by detecting and visualizing the heat signatures emitted by objects. These cameras capture the infrared radiation (heat) emitted by objects and convert it into a visible image.
When it comes to seeing through walls, thermal imaging cameras can be useful in certain scenarios. They can detect temperature differences on the surface of a wall, which can indicate the presence of objects or people on the other side. This technology is often used in various fields, including building inspections, law enforcement, and search and rescue operations.
However, it's important to note that thermal imaging cameras have limitations. They can only detect surface temperatures and temperature differences, so they cannot provide a detailed view of objects or people behind a wall. Additionally, thermal imaging cameras are not capable of seeing through all types of materials equally. Thick walls or walls made of certain materials, such as metals or heavily insulated materials, can significantly reduce the ability of thermal imaging cameras to detect temperature differences.
It's also worth mentioning that there are other technologies, such as radar-based systems and certain types of advanced medical imaging devices, that can penetrate walls to some extent. However, these technologies are typically highly specialized and not readily available for general use.