The speaker is sitting alone in a room on a Sunday afternoon, feeling bored and waiting for something to happen. They drive around in their car too fast, trying to change their perspective, but feel isolated. All they can see is a yellow lemon tree, and they wonder what happened to the blue sky they were told about yesterday. They want to go out but feel stuck inside their head. The lemon tree provides no company or joy, only isolation, and the speaker hopes something will happen and their companion will return soon.