Changing over KANSAS CITY, MO

The report, as filed

I first observed the object in the Western sky above my house, appearing more distant than a passing plane which was moving North to South and initially believed it was a Bald Eagle changing courses in the air due to a seemingly black body and a white "head." As I continued to watch the object, I could tell it was lower than the plane had been, was dropping altitude and appeared to be a tumbling black triangle or other polygonal shape before settling into one altitude which did not appear to change in any meaningful way. The object was moving West to East at a slow pace, without jerky movements and produced no sound. After it passed above my home and some power lines, it appeared to be rotating clockwise and was now a diamond shape like that found on an engagement ring. It passed above a nearby cell phone tower (~200ft high) as it continued East. As it reached a nearby highway (from what I could tell distance-wise), the object began tracking South. Still rotating and no marked change in speed. Direction change wasn't abrupt or concerning in any way. Throughout the viewing, the object would reflect the sun but seemingly only on one side as it rotated. Sketches of the object include one shape which is the "tumbler" and the second which is the "diamond." The video I have cannot be uploaded through the form because the file size is too large, do not want to add compression to the video to keep it its highest quality.

Held as-reported from National UFO Reporting Center (record NUFORC #178726). Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.