Neo-Concrete is an artistic movement that emerged in Brazil during the 1950s, focusing on the relationship between art and the viewer. It sought to expand the ideas of Concrete Art by emphasizing the sensory experience and emotional engagement of the audience. Artists aimed to create works that were not just visually appealing but also interactive and immersive. The movement was characterized by the use of geometric forms, vibrant colors, and innovative materials. Key figures in Neo-Concrete art include Lygia Clark and Hélio Oiticica, who explored concepts of participation and the physicality of art. Their works often encouraged viewers to engage with the art in a more personal and dynamic way.