This room explorer was built in April 2006 when I just started building with LEGO MINDSTORMS. Not much to say about this one, other than that I probably used it to practice my building and programming skills. With the concept of a ‘sensor’ being new to me then (hey, I was 12!), there were enough things to learn from it.
I used to share my pictures with other Mindstorms buiders on the then-existing LEGO Message boards, which closed a long time ago. This first touch with the Mindstorms community was the spark for much more in later years. My RCX is now packed away on a shelf (not gathering dust), but the community is still more alive than ever.