 During construction the underground parking garage remained open . An additional challenge was designing the structure to facilitate interior access for ongoing maintenance and repairs , while <unk> two levels of underground parking underneath . The challenge was solved by combining a T @-@ bar grid to absorb weight with about 150 " <unk> " , or " <unk> " , inserted through the video wall to support the glass blocks and absorb wind loads . This design allows for the removal of individual glass blocks for cleaning or repair without disruption to the display . The filtered air inside the towers helps minimize the need for cleaning . Crown Fountain 's design not only included interior access for technical repairs , but also incorporated exemplary , non @-@ <unk> , barrier @-@ free accessibility , because its interactivity is not limited to the able @-@ bodied . The force of the water accounts for the entire range of possible interactive visitors . 
