Most people talk about the domed kinetic sculptures (slow moving, self-propelled objects that the artist called "floats") that Breer built for the Pepsi Cola Pavilion at Expo '70 in Osaka, Japan. And rightly so: the Pavilion was a crowning achievement for Experiments in Art and Technology (E.A.T.). People who lived in Pittsburgh during the mid-1970s, however, might best remember Breer for the three floats he made for the 1974 Three Rivers Arts Festival— a mechanized crumpled plastic mass, pyramid, and stacked box "ziggurat" that crept slowly around a plaza near Gateway Center. So slowly in fact, that their movement was nearly imperceptible, until the viewer turned around to find the arrangement had changed.
I grew up in Pittsburgh but hadn't been born yet, so it was (exciting!) news to me when I discovered the documentation in the artist's Film Section file. There was apparently a concurrent gallery exhibition of some of Breer's smaller kinetic works, but I haven't been able to find out where that took place. Some photos to share anyway, pending more research.