<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31313585</termId><termName>Op art</termName><termType>PT</termType><termNote><![CDATA[ Refers to the international art movement that flourished in Europe and America in the mid-1960s. The style is charcterized by the careful manipulation of bold, sharply contrasting shapes and colors in order to create vitural movement, vibration, or chromatic tension. ]]></termNote><termCreatedDate>2026-03-30 20:24:31</termCreatedDate><relation><relationType>UF</relationType><termId>31313586</termId><termName>Abstract, Perceptual</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313587</termId><termName>Art Cinétique</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313588</termId><termName>Art Visuel</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313589</termId><termName>Art, Retinal</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313590</termId><termName>Op</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313591</termId><termName>Optical</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313592</termId><termName>Optical art</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313593</termId><termName>Perceptual Abstract</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313594</termId><termName>Retinal Art</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313595</termId><termName>art, Op</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31313596</termId><termName>art, Optical</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31302170</termId><termName>post-1945 fine arts styles and movements</termName><termType>PT</termType></relation></term>  </Zthes>