Why do straight lines curve for no reason?

Saved in:  
Bibliographic Details
Published in:Cross currents
Main Author: Sulivan, Jean 1913-1980 (Author)
Format: Print Article
Language:English
Check availability: HBZ Gateway
Journals Online & Print:
Drawer...
Fernleihe:Fernleihe für die Fachinformationsdienste
Published: Blackwell 1986
In: Cross currents