Lida Gifford, Biosciences.
Other guesses were the terrace at Building 91, a good guess since there are large rocks on the terrace and there was no reference scale in the photo.
Several others guessed Building 30, but they probably meant Building 33.
From the comments included with the entries, the "art exhibit," as this was named by Ben Reynolds, started when wires were added to the light fixtures in the stairwell to keep them stable in an earthquake. Balbino Mercadal said the stairwell was dark and needed more light, and after the lights were added, the stabilizing wires were added. Then came rocks and, where else but at the Lab, plastic figurines. Some figurines have been seen escaping up the wires due to the potentially lethal predators living on the rocks.
Laleh Cote couldn't remember where she saw them, but she knew they made her smile. Everyone can use a smile!
Someone brought fun clip toys to decorate the wire accents that stretch up the stairway, and these little guys are hanging out on the rocks. It always brightens my day when I walk through this area. Good luck to anyone who hasn't been in this building before haha, that's going to be tough!
-- Evelyn Davies
Dinosaurs, cows, ladybugs, and a snake, if I remember right - these all roam the river stone architectural feature in the 1st floor of the stairwell in Bldg. 33.
-- Marissa Smithwick