Low flying black shadow triangle in Queensland, Australia.I was standing outside on a one storey high verandah at a motel. I was facing south about 1km from the Rockhampton QLD CBD. Directly in front of me about 2-3 km away I noticed a dark (black) shape moving through the sky. It was triangular and insubstantial, more like a shadow than an object. It was approximately 100m above the buildings and was approximately the size of a city block 120m wide and 100 long at the point of the triangle. I could see the stars through the object which seemed to shimmer like a heat haze behind it. It was totally silent.The object travelled in a shallow arc from directly ahead towards my location. It passed by about 50m away (the other side of a four lane road) to my left. I lost sight of the object due to the roof of the verandah above my head.It travelled low in the sky no more than 200m high and travelled the distance in less than 1 minute although it appeared to be travelling very slowly. Intermittently it separated into three separate smaller triangles with dull whitish, yellowish lights which switched places but still within the outline of the larger triangle shape. It had reformed into one large triangle (still shadowy) when it passed over head to my left.I did not have time to get my camera. This is my third UFO sighting and is the only one that caused me to feel fear due to its proximity, its trajectory, size, and shadowy nature.