May 28, 2026
Mirror, mirror, on the wall?
Seeing Around Corners Using Smartphone-Grade Lidar
Your phone might peek around corners, but commenters say a mirror already did it first
TLDR: Researchers showed that cheap phone-grade lidar can detect objects hidden around corners, bringing an expensive lab trick much closer to everyday use. Commenters were split between impressed and hilariously unimpressed, with one basically asking whether scientists had just reinvented the mirror.
MIT researchers say cheap, phone-style laser sensors can now spot things hidden around corners, something that used to need giant lab machines costing a fortune. The big promise is simple: safer self-driving cars, smarter robots, and more people experimenting at home because the code is public. In plain English, they’re taking lots of noisy little snapshots and combining them until the hidden object starts to show up.
But the real action is in the peanut gallery, where the comments immediately turned this science story into a "have you tried a mirror?" showdown. One reader, cuechan, came in with the brutally practical energy of someone fixing a spaceship with duct tape: why not just stick a mirror at 45 degrees on the corner and look? That instantly changed the vibe from “futuristic breakthrough” to “tech reinvents household objects again.” Another commenter, ofrzeta, threw cold water on the hype by asking the obvious gotcha: does this only work if there’s a wall in the right place to bounce the light back? In other words, is this amazing corner-peeking trick actually a very picky party trick?
So yes, the science is real and genuinely impressive: a sub-$100 sensor doing what once needed elite hardware is a big deal. But the community mood is a mix of awe, skepticism, and top-tier internet snark. The headline achievement may be “seeing around corners,” yet commenters were more interested in seeing straight through the hype.
Key Points
- •A new study found that off-the-shelf smartphone-grade lidar costing under US $100 can detect and image objects hidden around corners.
- •Earlier non-line-of-sight imaging systems typically relied on specialized lab equipment costing about US $0.5 million to $1 million.
- •The researchers addressed consumer lidar limitations such as noise, low resolution, and motion blur by combining multiple measurements instead of relying on single images.
- •The system used a portable lidar setup with about 100 pixels, each made of a laser emitter and a single-photon detector.
- •In demonstrations, the researchers reconstructed 3D images of static hidden objects, tracked 3D motion of hidden objects of known shape, and used hidden objects as landmarks for sensor localization without specialized calibration.