Flat UI has fewer affordances (or "signifiers" as Donald Norman now refers to the concept.) For examples of issues caused by this see http://uxcritique.tumblr.c

Flat UI has fewer affordances (or "signifiers" as Donald Norman now refers to the concept.) For examples of issues caused by this see http://uxcritique.tumblr.com http://uxcritique.tumblr.com