Simulations using a computer model the Evolution Of Culture (EVOC) indicate that the clustering of creative agents decreases the mean fitness of ideas in the short term (when imitators have not yet been exposed to them) but increases idea fitness in the long term (presumably because agents swap partial solutions). With the steep fitness function used here, clustering decreases idea diversity. Author Keywords agent-based modeling, cultural evolution, creativity, clustering, imitation, 'artist loft effect' ACM Classification Keywords I.6.m Miscellaneous General Terms Algorithms