The word Tselem 6754 means
1a) images (of tumours,** mice**, heathen gods)
1b) image, likeness (of resemblance)
1c) mere, empty, image, semblance (fig.)
Gen 1:26 KJV - And God said , Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.
Maybe where the words for the poem, that inspired the title of the book came from???