Tracing the hidden dimension of line in architectural representation Abstract Tis research instrumentalizes the deliberation on drawing in architectural representation, in order to criticize the way of seeing that is dominated by recent media technologies and power relations. Tis paper intends to search how the drawing, in particular line-making, is afected in this environment, and how to respond to it via alternative, manipulative, and creative tactics of vision consid- ering drawing as a critical act. Te dependency of line on visuality is criticized by alternative drawing practices of contemporary line-makers. Consequently, imaginative, creative and layered qualities of design thinking, representation and production can be uncovered. Originality in architecture lies in its virtual, hid- den, unseen and unnoticed properties. Methodology selected is nourished by an argumentative method that is based on a system theory approach. A dialectical discussion is conducted utilizing some concepts such as visual-nonvisual, phys- ical-virtual, material-immaterial, and temporal-permanent. Following a qualita- tive approach, unbinding the concept of line changing on a similar axis with digi- tal mediums and tools, the conceptualization process of drawing from a historical point of view, questioning the new concepts that it relates to, and discussing the interaction of changes in line tools and representations constitute the path of this research. As a consequence, it may be proposed that prioritizing the unseen, mi- nor or secondary characteristics of design issues and their dynamic relationships may reveal an alternative line-making practice. Keywords Architectural representation, Digitalization, Drawing gaps, Hidden dimension of line, Visuality. Çağın TANRIVERDİ ÇETİN 1 , Yurdanur DÜLGEROĞLU YÜKSEL 2 1 cagin.t.cetin@gmail.com • Graduate Program of Architectural Design, Institute of Science, Engineering, and Technology, Istanbul Technical University, Istanbul, Turkey 2 d.yurdanur@gmail.com • Department of Architecture, Istanbul Technical University, Istanbul, Turkey (Emeritus) Received: September 2019 • Final Acceptance: December 2019 ITU A|Z • Vol 17 No 1 • March 2020 • 115-128 doi: 10.5505/itujfa.2020.78800