[General] bowing book spines

[demex]

You could only rely on ink and paper for consistency, not to mention the whole sensory experience of smelling and touching volumes, turning their pages, bowing their spines.

I am translating a short story from English to Chines, and came across the above sentence. The last three words are really confusing. What kind of action it may suggest?

Thanks.

 

[Rover_KE]

I am translating a short story from English to Chinese ...

Always tell us the title and author of any text you quote, please, demex.

 

[Phaedrus]

[strike]What kind of action it may suggest?[/strike]

See the image below.