4. Temperature-Sensitive Glass.
Why Kaplan digs it: "It's ability to change color through any kind of change in temperature. Examples are human touch, a change in ambient temperature, and coming into contact with warm or cold water. These tiles have been applied in a shower at one of the Disney World resort hotels where the color transitions from black to a more colorful palette of blue, greens, yellows, and reds as varying degrees of hot water hit the surfaces. We also feature a temperature-sensitive ceramic tile
which works off the same principle but is more cost-effective when the translucent nature and luxurious feel of glass are less critical to a project."