"Basketball" size ball flew in the sky in a "U" pattern the streaked in-between the two apartment buildings.Our apartment building is a few blocks from lake michigan and it is very dark in our neighbourhood. we were sitting and playing PS3 when I noticed a tiny ball of light fly from the street above our building, flew about a block then made a u-turn and then shot down and streaked in-between the two apartment buildings. We are on the second floor and the orb appeared to my boyfriend and I as about a basketball in size and extremely bright as it flew past our windows. He says it was medium blue with a white core, and I say it was lime green with a very bright centre. either way, the block only has one light about fifty feet away, and the area around the apartment buildings is VERY unlit, so this thing really lit up the common area in the two seconds it whizzed in a straight line towards lake Michigan at twenty feet above the ground lighting up the area around it, again it was very bright and colourful and it left a "trail" in our eyes that lasted for a few seconds, kind of like seeing a bright flashlight in a black room.This was not a meteorite or anything as I saw it fly to an altitude of maybe 150 feet before it dived and went by the window. shooting stars dont change course nor do they fly straight and level (at 20 feet) above the ground. We both work a lot and were not drinking at the time, we were just playing sky rim when we saw it.