On 7 of july (7) of year 1977 at 7 PM (all 7) I was on my balcony on third floor of my building in Barcelona (Spain). I saw a point of light, like a bulb, over another building at 200 meters in front of mine. The light seems to be so hight for be a bulb on the upper floor of the bulding. Then, when I was thinking this fact, the light grow and come in my direction. From my balcony I saw the object growing. When the object was over my building I saw like a sphere with an aileron all around. The sphera was between 80 and 100 meters large. Over this aileron I saw windows with an orange light inside. The sound was very grave and continous. Then the object passed over my building and I can't see it anymore. I ran to the rooftop when when I arrive the object was dissapeared. I was not affected emotionally. Maybe xcitted cause I liked and enjoy this moment. I'm not scarred about UFO's.17 years later I read in an revue (Karma 7) about UFO's an article speaking about an UFO over my city the same day I saw and over some villages they are in same direction my UFO goes. That means I was not the only one who saw this object.I add a picture. I hope u understand Spanish...