I was hanging out on my back balcony garden when I noticed a red shape floating in the sky. The deep red colour of the object didn't come through very well on the video for some reason, but I could definitely see it. The object was floating back and forth in roughly a north-south trajectory over a 40 minute period. It was roughly 2000-3000 feet in the sky, approximately 10 feet in diameter. The object moved both with purpose and randomly, it changed shape from spherical to a square-ish shape and back a few times and changed colour from red to black once. It was flying both against and with a northerly wind (coming from the left in the video). It flew off to the north after about 45 minutes and disappeared.