New York’s Harvard University now developed a technique that helpful in quickly changing the opacity of a window. You can say goodbye to your curtains, this smart window opacity turning it clear, cloudy and somewhere in between with the flick of a switch.

Before the technologies used in “Tunable” windows which is relied on electrochemical reactions and it were really very expensive.

David Clarke said, “However, the new technology uses geometry to adjust the transparency of a window which is a much cheaper option,”

He added,“Because this is a physical phenomenon rather than based on a chemical reaction, it is a simpler and potentially cheaper way to achieve commercial tunable windows,”

David Clarke is from Harvard’s John A. Paulson School of Engineering and Applied Sciences.

Samuel Shian said, “It’s like a frozen pond. If the frozen pond is smooth, you can see through the ice. But if the ice is heavily scratched, you can’t see through,”