Signs of Progression in the Personifications of the Seasons in Roman Mosaics : The Artistic Approach, Procedures and Tools Used by the Craftsmen to Relate the Viewer to the Experience of the Passing of Time. - Kramer, Maja (Uludag Üniversitesi, Mozaik Arastirmalari Uygulama ve Arastirma Merkezi,., 2011)