His friend Kotarbiński formulated a very extreme nominalism, called variously reism, pansomatism, and concretism, according to which the only things that exist are material bodies.    From Wordnik.com.  [Stanisław Leśniewski] Reference

Although the terminology varies (one can equivalently speak about reism, concretism or nominalism), two claims of any theory going against general (abstract) objects should be very sharply distinguished.    From Wordnik.com.  [Lvov-Warsaw School] Reference

Schendel's interest in poetry and sparse graphic forms tied her to concretism, just as her manipulation of paper aligned her with Neo-concretism.    From Wordnik.com.  [artforum.com] Reference