What, in general, makes something fun to design?

@mikemearls Saw your tweet about having fun designing something. What, in general, makes something fun to design?

— George Sutherland H (@Acr0ssTh3P0nd) November 10, 2016

For me, it's building the gap between what I envision and what the system can do in an evocative but easy to manage way. #wotcstaff https://t.co/VZMJMuE5x2

— (((Mike Mearls))) (@mikemearls) November 10, 2016