ITC Conduit was designed by Mark van Bronkhorst based on the letters on ordinary signage done by a non-professional. He took the regular but awkward forms and added his experienced sense of design and proportion...and in the process broke almost every rule. The forms were made with a grid, "like the 90 degree corners in real conduits with all the tips and corners rounded off." A few optical corrections produced ITC Conduit, a fairly narrow, square and highly legible sans serif typeface.