The transformation #f(x)->f(x+h)# can be understood as an advance. The graphics of #g_2(x)=f(x+h)# is advanced for an amount #h# concerning #g_1(x)=f(x)# As can be seen in the attached plot, the red plot occours before the blue plot. When the blue plot is at #x=0# with value #sin(0)# the red plot has the value associated to #sin(1)#