Lorenzo was walking up to the astronomy tower after a long day of doing test after test. He had his messenger bag thrown lazily over his shoulder, slipping down from time to time. He was really tired and just wanted to sit down to watch the sky full of white clouds. He opened the door of the tower and walked in, closing the door behind him. He was so distracted and sleepy that he accidentally stepped on someone's feet while walking to his favourite place. He didn't even notice them.