The design problem here was not only to find a way to capture visually one of the most enigmatic and fundamental properties behind quantum physics—entanglement—but also to address the multiple individuals who developed this field of scientific understanding. Author Louisa Gilder shapes this development into an extended and accessible dialogue between these legendary physicists. In the title, Entanglement works doubly as a metaphor for this deep connection between the physicists and for the scientific principle, which can be generally understood as follows: quantum entanglement is a phenomenon by which the states of two objects are linked together so that affecting one will affect its counterpart simultaneously, even though the individual objects may be spatially separated. 

The play of type and imagery enhances the title and makes the content so much more enticing.