We were visiting paris in june 2016, whilst looking from the first viewing platform we noticed a transparent orb in the distance, which when viewed through the 'telescope' apparatus provided on the tower appeared to have a small red light in the centre. it was completely stationary, did not have any form of suspension to keep it in the air (e.G. lines, supports). it was visible barely with the naked eye. i had taken several pictures of the scenery of paris from the tower and was only aware that we had captured the orb when reviewing the photos this year. i considered this to be a cctv apparatus at the time but when searching the internet for anything similar, i can find nothing of this kind.