This is a hack that can be used for good or evil. You may have a good reason for needing to see through a frosted glass window or you may be Penn Badgley’s character in You. The hack works either way.
Redditor u/UnableNefariousness, who I will assume is an upstanding citizen who would never use this hack for nefarious purposes, shared a video to r/BlackMagicFuckery. That’s the perfect name for this subreddit, if this video is a good sample of its contents. In it, we see someone rub a small piece of clear tape onto a piece of frosted glass. The tape forms a perfect see-through rectangle through the frost:
Clear tape makes frosted glass see through from r/blackmagicfuckery
How on earth does this work? Here’s the science, from u/piterrogulski:
The frosted effect is created by making the surface rough - it’s not flat anymore, so light passing through the pane gets scattered in all directions. Sticking a tape onto it fills the surface with the glue, making it smooth - light can pass in a more or less straight line
If you’re planning to examine all your bathroom windows to see if anyone has been peeping on you, there is some good news from u/Mr0lsen. The bumpy side usually faces in:
Only works from the textured side, which is almost always on the same side as whatever is supposed to be obscured.
So, maybe this is more of a hack for people who like to look outside while taking a shower or discreetly check who’s at the door. Sorry, creepers.