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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Scientists Create a Drone That Almost Becomes Invisible Using a Clever Visual Trick

Imagine a drone flying right in front of you, yet you can barely notice it. It may sound like science fiction, but engineers at Northwestern University have developed a new drone that almost disappears from sight by taking advantage of the way the human eye works.

Instead of using expensive camouflage, transparent materials or futuristic invisibility technology, the researchers created a drone that hides in plain sight through rapid spinning. The new design, called "Phantom Twist," uses a simple but powerful optical illusion that makes it appear as nothing more than a faint blur.

A New Approach to Making Drones Less Visible

For many years, scientists have been trying to make drones invisible. Most attempts focused on covering drones with camouflage, using transparent materials or bending light around them. While these methods can work in certain situations, they are often complicated, expensive and difficult to use in real-world environments.

The Northwestern University team decided to take a completely different approach. Instead of changing how the drone looks, they changed how our eyes perceive it.

Their idea was inspired by something everyone has seen before. When a ceiling fan or propeller spins very fast, the blades almost disappear, leaving behind only a blurry image. This effect is known as motion blur, and it occurs because the human eye cannot clearly detect objects moving at extremely high speeds.

The researchers wondered if an entire drone could be designed around this natural limitation of human vision.

Meet the Phantom Twist

The result is the Phantom Twist, a unique drone unlike traditional quadcopters.

Most drones have four propellers attached to a body that remains still while the propellers spin. Even though the propellers become blurry, the central body stays clearly visible.

The Phantom Twist works differently.

It has only one motor and one propeller. As the propeller spins in one direction, the rest of the drone rotates in the opposite direction. This means every part of the drone is constantly moving.

The drone spins as fast as 25 times every second, which is far too fast for human eyes to follow. Instead of seeing a solid object, people see only a faint, ghost-like cloud that blends naturally into the background.

Although the drone is not completely invisible, it becomes extremely difficult to notice.

Why Human Eyes Get Tricked

The secret behind the Phantom Twist lies in how our vision works.

Human eyes do not capture images instantly. Instead, they collect visual information over a very short period of time, similar to how a camera uses an exposure time.

When an object moves very quickly, the light from different positions gets blended together. As a result, the object loses its sharp edges and becomes blurred.

Computer vision expert Emma Alexander explained that because the Phantom Twist contains only a few solid components, these parts visually mix with the surrounding environment while spinning rapidly.

Instead of seeing a clear drone, observers only notice a slight haze floating through the air.

This clever use of motion blur allows the drone to remain much less noticeable without relying on expensive invisibility technologies.

Designed by Artificial Intelligence

Creating such an unusual drone required much more than trial and error.

The research team first used computer models to generate nearly 20,000 possible drone designs that could fly safely and remain balanced.

Artificial intelligence and advanced optimization algorithms then examined these designs.

The AI repeatedly rearranged important parts of the drone, including:

  • The motor

  • The propeller

  • Batteries

  • Circuit board

  • Counterweight

The goal was to place every component where it would be hardest to notice from almost every viewing angle while still allowing the drone to fly properly.

Testing Thousands of Designs

After generating thousands of possible layouts, the engineers carefully tested each one using computer simulations.

They placed images of the spinning drones onto 100 different real-world backgrounds, including natural environments and everyday scenes.

Next, they used a perception model that closely imitates human vision to estimate how visible each drone appeared.

Designs that blended better into their surroundings received lower visibility scores.

The researchers selected the 500 best-performing designs and allowed the AI to continue refining them.

This automated process repeated many times until the software identified the most effective design.

Only after the computer confirmed that the drone met all requirements did the engineers build a real prototype.

A Drone That Blends Into Its Surroundings

One of the most interesting features of the Phantom Twist is how its components are arranged.

Instead of placing all parts close together like a normal drone, the engineers spread them apart at different heights and angles.

When the drone spins rapidly, these separated parts do not overlap visually.

Instead, they merge into a soft, semi-transparent cloud that blends with the background rather than forming a recognizable object.

According to the team's visibility measurements, the Phantom Twist is about ten times less noticeable than a standard quadcopter.

That makes it one of the least visually disruptive drone designs ever created.

Why This Technology Matters

Making drones harder to notice could provide important benefits in many fields.

Wildlife Research

Animals often react when they notice drones flying overhead. Birds may abandon nests, mammals may run away and marine animals can change their behavior.

A less visible drone could observe wildlife more naturally without disturbing animals.

Environmental Monitoring

Scientists frequently use drones to study forests, wetlands, rivers and coastlines.

A drone that blends into the environment could collect more accurate information while causing less disruption to ecosystems.

Infrastructure Inspection

Engineers inspect bridges, power lines, pipelines and tall buildings using drones.

A low-visibility drone could perform these inspections without distracting nearby workers or the public.

Scientific Research

Researchers studying animal behavior, ecosystems or outdoor experiments could gather better data because subjects would be less likely to notice the drone.

Still Room for Improvement

Although the Phantom Twist is highly innovative, it is not perfect.

The drone still produces noticeable noise because of its spinning propeller.

Its wires and support rods can also remain visible under certain lighting conditions.

The research team believes future versions could become even harder to detect by using:

  • More transparent construction materials

  • Quieter propulsion systems

  • Improved internal designs

  • Better optimization algorithms

These improvements could reduce both the visual and audible presence of the drone.

Presented at an International Robotics Conference

The Northwestern University researchers presented the Phantom Twist at Robotics: Science and Systems 2026 in Sydney, Australia.

Their research paper, titled "Computational Design of a Low-Visibility UAV Using Human-Aligned Perceptual Metric," introduces a completely new way of thinking about drone design.

Rather than trying to hide a drone through camouflage or advanced optical materials, the team designed the drone around the limitations of human perception itself.

A Glimpse Into the Future

The Phantom Twist demonstrates that sometimes the smartest engineering solutions come from understanding human biology instead of building more complicated machines.

By combining artificial intelligence, robotics and the science of human vision, Northwestern University engineers have created a drone that almost disappears without using futuristic invisibility cloaks.

While it still has challenges to overcome, this breakthrough could lead to quieter, less distracting drones that monitor wildlife, inspect infrastructure and support scientific research with minimal impact on the world around them.

The Phantom Twist is a powerful reminder that innovation doesn't always mean making something invisible—it can also mean changing the way we see it.

Reference: Jingxian Wang, et al. Computational Design of a Low-Visibility UAV Using a Human-Aligned Perceptual Metric. roboticsconference.org/program/papers/196/

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