Tonight brings the opening feature of the 19th Chicago Underground Film Festival: The Fourth Dimension, which anthologizes shorts by Harmony Korine (Gummo, Julien Donkey-Boy, Trash Humpers), Aleksei Fedorchenko (Silent Souls), and Jan Kwiecinski. The festival continues through next Thursday, with all programs at Gene Siskel Film Center; check out our festival sidebar, with reviews of The Fourth Dimension and ten more features.