In 1966, Robert Smithson created a series of works called Alogon. The second piece in the series was exhibited at the seminal exhibition of minimalist work called Primary Structures in 1966. This piece is currently in the Museum of Modern Art collection. Of the work, Oxford University Press says:
[E]ach [work is] composed of a number of step structures arranged in order of decreasing size, conveying Smithson’s belief in the illogical and absurd nature of existence. Though each of the parts is static, their dynamic arrangement introduces tension into the work as a whole.
I hadn't seen this work until recently, but find it interesting to look at in comparison to his bigger land-art works, such as Spiral Jetty.