The spectrum of imagination is what the sleeper sees during his sleep, and here it is related to visiting the beloved spectrum during a dream, and it is an expression of the lover's preoccupation with his beloved, which prevented the circumstances between him and the meeting with it, so the lover remains busy with it always thinking about it, so he communicates with it during sleep This was one of the most important topics of Arab poetry from pre -Islamic poetry to the era of Sharif Al -Murtada (436 AH), the author of this book.