Attached Bookshelf Track

This project is a track attached to the bookshelf, connected to the desk from one of the layers on the shelf. Because it is placed in the children's room, it looks like the track of a toy train. When the user needs to get the stationery box on the bookshelf, this attached track will be dropped, and the box will be like a train carriage following the track to the desktop; when the user is finished using the items, it will follow the track to the original position.