Perfect interactive design isn't it? It tells you what it is (the form is a plastic room key), where it's from (the Clift Hotel) and how to use it (insert the top of the triangle into the door). Nothing more needed. interactive design is self-explanatory.
Room Key from the Clift Hotel
MARNEY
All Things Interactive
All Things Interactive
                                   
Marney is the founder of Animatrix, an interactive consulting firm that has shipped over 300 projects in the last 25 years for companies that include Apple, BearingPoint, KPMG, Clinique, The Limited, AT&T, NewsCorp, The Walt Disney Company, The National Academy of Science and many others.
                         
Marney.com is about interactive design- the creation of any experience that starts with the user. It can be a site, an ad,  a toy, a place, an object.... anything that's designed for engagement.
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