 Jonathan Jones, art critic of "The Guardian", has spoken out on Cartrain's behalf.Cartrain has posted a video on YouTube, showing himself putting up a piece of cardboard box as a conceptual artwork in Tate Modern; he states, "I managed to put my cardboard box up in the Tate Modern for two hours without being spotted as a fake".Another video shows him installing a collage incorporating Hirst's skull image, and titled "Damien Hirst", in the National Portrait Gallery.