Host Analog, Environmental sculpture at Oregon Convention Center, Portland, US

Host Analog is a 1991 outdoor sculpture by Buster Simpson outside the Oregon Convention Center in Portland. It consists of a 1,000-year-old wind-fallen Douglas fir log from the Bull Run River watershed, cut into pieces so it resembles a fallen Roman column. A stainless steel irrigation system sprays mist over the log in fifteen-minute increments, and seedlings from Oregon's old-growth forest grow around it.

The Douglas fir log is a wind-fallen tree from the Bull Run River watershed east of Portland, estimated at 1,000 years old. Artist Buster Simpson cut it into pieces resembling a fallen Roman column and installed it outside the Oregon Convention Center in 1991. The work is part of the Regional Arts & Culture Council collection.

The work demonstrates how urban spaces can support forest ecosystems by watching plants grow and change around the log. You can see how nature adapts and thrives in the middle of the city.

The sculpture sits near the convention center's main entrance and is easy to reach on foot. Informational signs along the installation explain how the plants and ecosystem have developed over time.

The installation includes a nine-year visual record showing plant growth and changes around the log captured in photographs. This documented progression allows visitors to see years of natural transformation displayed side by side.