Checked out Petr Pastrnak's exhibition a few weeks ago at the Vaclava Spaly gallery in downtown Prague, near Narodni Trida station.
The above piece is an example of the artwork on display. 20 crowns with a student discount. Nice quiet open space. Three floors of art. Minimal information in English (none) but enjoyable nonetheless.
http://www.spalovka.cz/cz/ Exhibit runs to the 27th of February.