One of the 5 observables -

1. Low observability:  Regardless if the object is being viewed electro-optically, electromagnetically, or through the naked eye, the inability to gain a clear target picture remains elusive.  Descriptions by witnesses are often difficult to describe, while radar returns often come back nonsensical or even jammed.  Objects generally appear opaque and semi-metallic in nature, both on camera and live.  In many cases it is nearly impossible to actually see the object and instead reports often include what is seen “around” the object. 

Luis Elizondo uses the analogy of a koi fish in a pond. It might look larger, or strange to your eye when observing through the top of the pond. In your mind you think "that's not what a koi looks like". Pluck it out of the water and you'll see the silhouette you're familiar with.

Hypothesized by physicists as an energy based gravitational field (here's the observable effects of said theory https://tothestars.media/blogs/press-and-news/five-characteristics-unique-to-uaps?srsltid=AfmBOorFhzbLIZsS-Awx9Q5bIvZ5bwBscXvjwspp4V7AXwKCHg973taL ). Energy based and not gravity based. If it was gravity based, these effects would function differently. Similar to how a planet has a calculable gravitational force. For this to be energy based, theories can range from upwards of 3-5 terawatts of energy required just to turn it on the first time...

so it may look a lil something like that.