Silent delta-shaped object seen in Savage, MN against clear October night sky.Observed a delta-shaped object in clear skies. Object had 3 soft white lights at the vertices which shone downward. Approximately 40 feet in width. No other discernable lights or charactaristics. Moved in a south by southwesterly direction at approximately 150kts. Appeared to be about 1500 feet AGL. Made no sound, though it appeared close enough to be audible if it had jet enines. Left no contrails. Observed maintaining straight and level course for about 5 seconds, then rolled right to a 45 degree angle which caused the downward lights to shine brighter, as they were directed more towards the observer. After 1 second, object then rolled left back to a straight and level position. Object never appeared to change course or altitude during this rolling activity. Lost track of object due to distance and the horizon. Event took place near the intersection of Highway 13 and County Road 42 in Savage, MN while facing westward, and up at about a 30 degree angle. Background was a dark sky with a few visible stars, including Orion in the east. Highway 13 was illuminated, but obscured by a small hill in front of the observer. Slight glow seen over the crest of the hill from these lights, as well as the columns of light from Lake to the west. Object was just west of Highway 13, but certainly east of Lake, as it was observed passing in front of the beams of light from the casino. Observer is a pilot and is familliar with the air traffic around Minneapolis International Airport, about 20 miles to the northeast. This object did not conform to any recognizable aircraft lighting or flight patterns around MSP. No navigational lighting, beacon, or landing lights were observed. Object could not have been part of the air traffic pattern from MSP, as it was far too low. Also, the sudden rolling activity seemed very uncharacteristic for commercial aircraft. Lack of sound and contrails is very curious.