GRAY% is a brand of cement creative design products. This branding calendar is inspired by the Italian designer Enzo Mari and his first children's game of 16 Animal Puzzles. The calendar is a simple geometric puzzle composed of four simple shapes. The cement puzzle shapes and graphics on paper combine to present a different day of the month without any two ever being the same. Users can choose one or more cement shapes according to their own preferences to match the graphics on the paper calendar. Unlike typical calendars, this one changes its visuals in myriad ways, offering an element of fun interaction and participation.