On the evening of june 24, 2018, i saw a black triangular object when i was about to enter my house. i first thought of the object as a bird or black plastic bag, but then noticed how it had a clear flight path. i then thought it was a drone, but then realised it was completely silent. i took my phone to film the object but was disappointed by how the camera failed to capture it clearly, so i turned it off. the object made a 90-degree turn, heading toward a tree right across my house (this way, i could identify it as flying at treetop level). upon making the turn, the shape of object appeared to have changed. from this vantage point, it was no longer triangular, but rather "vertical" and a bit contracted/distorted. soon after, the object suddenly disappeared into thin air. after the sighting, i checked the video again. the strange thing is the object captured in the video appears to be much smaller and flying at a much higher altitude than what i actually saw.