When using a TI, firefighters should not confuse the ability to "see" with the presence of a safe environment. Firefighters should remember that when they "see" with the TI, they are not getting the same perspective as they would get with their eyes. Depth perception and peripheral vision are reduced with a TI. Many objects appear different when viewed with a thermal imager. A puddle of water can look indistinguishable from a hole in the floor.