Book cover for a treatise on color theory from 1704. Vertical orientation with capitalised text explaining the work's title which reads [[OPTICKS: OR A TREATISE OF THE REFLEXIONS, REFRACTIONS, INFLEXIONS and COLORS OF LIGHT. ALSO Two TREATISES OF THE SPECIES and MAGNITUDE OF Curvilinear Figures.], with the words [OPTICKS] [LIGHT] and [Curvilinear Figures] in red and the rest in black. Underneath black text is printed giving the publication details, which reads [LONDON, Printed for SAM SMITH, and BEN J. WALFORD. Printers to the Royal Society, at the Prince’s Arms in St. Paul’s Church-yard.], with the words [LONDON], [SAM SMITH], and [BEN J. WALFORD] in capital letters with the names in red and the words [Prince's Arms] and [St. Pauls] in italics. The text is followed by the Roman numerals [MDCCIV] which indicates the year 1704. The text is printed inside a rectangle outlined with thin black lines just off center to our left.