I was sitting on my balcony overlooking downtown denver reading the news when the object caught my eye. it came from the direction of downtown going in an east northeast trajectory very slow without emitting any sound. the object was bright white in a thin triangular shape. the object had no lights or any type of characteristics. it was solid and flat in appearance. what made me observe it closer was when it completely stopped and hovered in a stationary position for few seconds until it darted to the west at a fast speed. it was at that point i realized it was not any conventional aircraft or drone. i tried to capture it on video but i wasn't able to get it. i saw it a second time further to the north. so i tried again to capture it on video, but i wasn't able to. i'm attaching both videos in hope someone might see it. it's not easy because it is bright white in color, so it disappears into the backdrop of the clouds.