Each of the games in the Portal series went through many iterations and multiple design phases before their official release. At various stages of each game's development and release, various pieces of concept art were made public.
Portal
GLaDOS GLaDOS concept art GLaDOS concept art
GLaDOS concept art GLaDOS concept art
Portal 2
Aperture Science Handheld Portal Device
Handheld Portal Device Portal Gun concept art Portal Gun concept art
Chell
Chell Chell concept art Chell concept art
Chell concept art Chell concept art
Chell concept art Chell concept art
Chell concept art Chell concept art
Chell concept art Chell concept art
Chell concept art Chell concept art
Chell concept art Chell concept art
Chell concept art Chell concept art
Atlas and P-Body
Atlas and P-Body Concept Art Atlas and P-Body concept art Atlas and P-Body concept art
Atlas and P-Body concept art Atlas and P-Body concept art
Atlas and P-Body concept art Atlas and P-Body concept art
Atlas and P-Body concept art Atlas and P-Body concept art
Atlas and P-Body concept art Atlas and P-Body concept art
Atlas and P-Body concept art Atlas and P-Body concept art
Atlas and P-Body concept art Atlas and P-Body concept art
Atlas and P-Body concept art Atlas and P-Body concept art
Atlas and P-Body concept art Atlas and P-Body concept art
Forgotten Aperture Science Facility
Old Aperture Science Facility Old Aperture Science concept art Old Aperture Science concept art
Old Aperture Science concept art Old Aperture Science concept art
Old Aperture Science concept art Old Aperture Science concept art
Old Aperture Science concept art Old Aperture Science concept art
Dioramas
Scrapped Aperture Science Diorama Exhibition Diorama concept screenshot Diorama concept screenshot
Diorama concept screenshot Diorama concept screenshot
Box Art
Portal 2 concept box art Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
Portal 2 concept box art design Portal 2 concept box art design
