Like UFO sightings, people have taken note (and plenty of pictures) of the giant white orbs that have lately popped up for a day in several Austin Parks.

“Omission” at Seabright Metropolitan Park. Photo by Jeanne Claire van Ryzin

Consisting of 20 10-foot inflatable white vinyl spheres, Juan Deleon’s “Omission” is a roving one-day installation, making a tour of public parks as part of the city’s “Tempo” project of temporary public art.

First they appeared at Boggy Creek Park in late Ausgust configured in a grid.

A few weeks later, a neat white line of the white orbs appeared for a Saturday at Seabright Metropolitan Park.

A spirited homage to open natural spaces, “Omission” takes up its next one-day residency this Saturday in the park near Longhorn Dam at the eastern end of Lady Bird Lake.

“Omission” is on view 10 a.m. to 5 p.m. Saturday. Longhorn Shores Park, 60 S. Pleasant Valley Road

At each location, Deleon changes up the arrangement of the giant orbs. You’ll have to go see them to see what shape the orbs take up next.

After this weekend, “Omission” will appear next on Oct. 24 at the Manchaca Public Library.

Then, timed to the East Austin Studio Tour, it will return to Boggy Creek Park Nov. 14-15.