In a desert
You're standing
A silhouette
In motion
From what I get out of these first lyrics of the song, I think the singer is remembering an old friend/lover who is not in his life anymore. The desert is his memory, he's forgotten most of the memories he shared with this person, making them even more distant from each other now. The person is a only a silhouette because he remembers him/her but only vaguely, he's forgotten the details. He doesn't feel like he really knows them anymore.
In a desert You're standing A silhouette In motion
From what I get out of these first lyrics of the song, I think the singer is remembering an old friend/lover who is not in his life anymore. The desert is his memory, he's forgotten most of the memories he shared with this person, making them even more distant from each other now. The person is a only a silhouette because he remembers him/her but only vaguely, he's forgotten the details. He doesn't feel like he really knows them anymore.