“…Drawing is a problem-solving activity, and drawing "errors" are solutions with which children solve the dilemma of representing three-dimensional reality on a two-dimensional surface (Quaglia et al, 2015). In earlier studies there was a desire to classify the stages of artistic development into specific age periods (Gerlovič & Gregorač, 1968;Horvat-Magajna, 1989;Hurlock, 1956;Karlavaris, 1986;Kellogg, 1970;Lowenfeld & Brittain, 1981;Luquet, 1927;Toličič & Smiljanić, 1979), but this is less present in later research (Lange-Kuettner, 2008. Indeed, the prevailing opinion today is that we should not define the phases of development in the framework of age, because of the differences in the pace of artistic development, but as the characteristics of each period (Cox, 1997;Hurwitz & Day, 2007;Vrlič, 2001), as categorised by their predominant features (Anning & Ring, 2004;Roland, 2006).…”