Various forms of street art, such as murals, anamorphic painting or urban interventions, become an important component of urban space. The paper examines examples of selected works of urban art in the context of space and its reception. These unexpected “events” entertain and educate. They become, on the one hand, a tourist attraction, and on the other hand, a major voice in the debate on the public nature of visual urban sphere. Although ephemeral and inconspicuous, usually reluctantly accepted by architects and urban planners, they successfully urge viewers to reflect on space and its existing functions.