Analogous Spaces: An Introduction to Spatial Metaphors for the Organization of Knowledge. - Wouter Van Acker; Pieter Uyttenhove (Libr. Trends, 2012)

Library Towers and the Vertical Dimension of Knowledge. - Wouter Van Acker; Pieter Uyttenhove; Sylvia Van Peteghem (Libr. Trends, 2014)