In 1965 he began teaching in the Department of Architecture in Cambridge and taking on independent commissions. Cullinan's first projects were houses, e.g. Highgrove, for Hillingdon Council. The Minster Lovell Conference Centre, in the Cotswolds, was the first of Cullinan's buildings to achieve critical attention as a model of the marriage of old and new. In 1992 he expanded his work overseas with developments in Tama Forest, a Japanese National Park, and at the University of North Carolina, Charlotte. These defects present a number of different scenarios for creating the primordial fluctuations in matter density which seeded galaxy formation.
Cosmic strings are filaments, with regions in the symmetric phases, perhaps trapped in their core.
The influence of these on the galaxy formation and on the imbalance between the numbers of protons and antiprotons can be investigated. Looking for Evidence Experiments to demonstrate these effects cannot be carried out as the temperatures in the early universe are too high to replicate, so we have to look for evidence in the traces left over. Possible evidence of these topological defects may exist in the cosmic background radiation. However, to distinguish between different cosmological theories needs the increased sensitivity of future experiments. Cosmic strings, left over relics of high density from the very early universe which serve as gravitational seeds for the growth of structure, will leave their imprint in the cosmic microwave radiation in the form of temperature fluctuations.