At approximately 9:00 pm, I noticed a large disk shaped light hovering low in the sky, west from my house, over Camano Island, WA. I have lived in this house for 13 years, and I know what the night sky looks like, looking west. This was like nothing I’ve seen before. Three other people in my house joined me in looking at this object. It was pulsing and changed colors, which was visible with the naked eye. We started looking at it with binoculars, and could see more details. It was rotating and appeared to have four smaller lights inside. There were a couple of airplanes that passed by in the time that we were looking at it, and it appeared to be about 20 times bigger than the planes. A point of reference that we had was a tower on Camano Island that has a red flashing light, and is about 120 ft. tall. The disk shaped object was to the south of this tower, and was a little higher in the sky. The colors that we saw were white, red, blue, purple, orange, and yellow. It was visible to us for about 20 minutes, and then it just disappeared.