To the right, you will see two panels with screenshots of other 3D virtual art exhibits, the black-bordered screens.
To visit the pictured exhibit, simply pick (tap/click) it. A menu will appear at the bottom-right of the screen, with a link icon (chain-link), select it to head unto the selected exhibit.
BE ADVISED: Seeing as a new tab or window is spawned, upon clicking through from one exhibit to another, it is advisable you close all exhibits you are not actively exploring. This will help keep system resource and memory usage at a minimum.