Buildings can save energy by making the most of natural light, but covering walls with transparent glass has problems such as the loss of privacy because the inside is visible, and the sunlight can ...

Frosted glass has an opaque, hazy finish that provides privacy while still allowing in light. Frosted glass is most often used in bathroom windows, shower doors, and front doors, though you'll also ...

Glare-free windows could be made from a material studded with billions of tiny metal patches. This makes a one-way window that is matte – it looks opaque, reflecting barely 1 per cent of light from ...