River Sculpture (Allison Sky)

On the façade of the Grove Hotel in downtown Boise, a river runs up the wall. According to Boise City Arts & History, River Sculpture by Alison Sky was carved into the granite and turns the building into a symbolic river flowing vertically through downtown. It honours the Boise River and the city's historic irrigation canals, which the department calls lifelines that shaped the region's development.

The work was unveiled in 1999 and combines granite, fused glass tiles, LED lighting and mist; the mist was originally a fogging feature. A major restoration in 2015 replaced the background with more than 140,000 glass tiles and updated the lighting and filtration systems, while nearly all of the original granite was kept. The city describes it as part public art, part architectural landmark.