I was looking at the flock of geese flying overhead. it was a bright clear blue sky. i looked further out and up and saw a light white colour the shape of a rectangle about 4miles away and 1000,ft in the sky. my eyes instantly locked on. i kept watching the sky as it moved from my left to right. it was the size of a hospital. i kept following it visually till a row of trees blocked my sight. i ran to the end of the trees trying to keep sight of it. as i reached the end of the trees it had already disappeared in less than 30 seconds. i felt as if it could see me watching it. i knew that i knew that i knew that this was not at all normal.