Saw a UFo in the sky while waiting for food delivery.

After work, I arrived home around 5 PM. Felt extremely tired, watched a movie and fell asleep listening to some ambient music. Sometime after 11 PM, I woke up and felt very much hangry. So, I ordered a food delivery through the iPhone app. Fast forward about 30 minutes, and I got a notification. Which I assumed was the delivery being dropped downstairs. I had left the iPhone charging. When I heard the notification bell ring, I ran downstairs. Assuming that the food delivery had arrived. Except, it had not. I had jumped the gun and now found myself outside holding the door to my building in one hand, wondering if I should stay waiting outside or not. It was a bit cold but I was dressed warmly.
Then suddenly, as I stood there trying to make up my mind. Out of the corner of my eye, I saw this luminous rotating weird looking thing. Yes, a thing. Pardon me for using that wrecked word. But understand that we do not have a proper word in any language which would make you "get it" instantly. Anyhow, I saw this luminous object go behind the building which is partly facing my apartment building. I thought to myself; "Why is that helicopter making no sound?" I assumed as much because just a couple of blocks away from home sits one of them big hospitals in New Brunswick. So, I assumed that this rotating luminousity was a helicopter. But when it came out the other side of the building, I could see very clearly that it was no helicopter. It was a disk-shaped object.
Through the entire duration of this sighthing, I was always left wondering what I was looking at. And it really didn't matter how my brain would go about trying to make sense out of this object. The more I looked, the more baffled and confused I became. For starters, the object was very much ridiculous looking. But most importantly, it made absolutely zero sense whatsoever. The shape wasn't aerodynamic in any way. The luminosity was constantly swirling into a series of waves which would change in intensity as the colors would ripple into one another. There was a specific sequence in the color changing pattern. "The waves" would be first yellow then morph into orange, then into red and then go back to orange and then, into yellow again and so on. In the center, It was a pitch black round disk-like completely black structure. The whole thing was tilted at a 45 degree angle as it moved forward. A dark disc-like object with a surrounding perimeter which was a luminous mass of colorful rotation. An ever-swirling changing coloration. To add more intrigue, the object was slowly positioning itself as it moved forward and upwards, in an elliptical pattern. The trajectory wasn't affected in any shape or form by this repositioning. Last but not least, it didn't make any sound. And if it did it wasn't loud enough to be heard from my vantage point.