Griffin was completely invisible to anyone until he had happened to step in some mud by chance which has paved for him to leave footprints as he walked further his footprints were viewed by two boys who followed him as long as the  footprints of him were visible he got rid of those two boys and went into big london store to put on some warm clothes after the store was shut he put on his shoes along with an overcoat and a wide brimmed hat this made him invisible to the people who came to work at the store the very next day