In Glattfelders artistic evolution the following stages may be pointed out:

approaches 1963 – 66
early reliefs 1965 – 67
pyramid –reliefs 1967 – 75
nets and colour – rulers 1972 – 75
tensions space – surface – space 1974 – 77
non- euclidean metaphors 1977 –
non-euclidean metaphors as permutation 1984 –
topological explorations 1988 -95
synthetic reliefs 1994 –
counterpoint with oscillating lines 1998 -
works in an architectural context