So follow this in your mind

So follow this in your mind - Does mind here mean memory? I fail to understand what is follow something in the mind

(It's about memorizing) Try to follow them now. You stand at the door. You go down the stairs. In front of the house, there is a car. You follow the street and, on the right side, there is a wall. And you come to a big place with a city hall in the background. So follow this in your mind, you need to keep the sequence. From the door, down the stairs, in front of the house...