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Each of its brightly colored concentric circles would soon be occupied as children plopped down for story time and games such as Jenga.

Unlike at many such events, people were allowed to move at an unhurried pace, flowing in concentric circles around the casket set atop the same catafalque used in 1865 to hold Abraham Lincoln’s body.

“I wanted to have 30 to 80 vocalists in these different areas of the landscape, and a word or phrase is passed from person to person to person, creating a concentric ring or geometric patterns.”

Rather than relying on a curved shape, the lens is made of concentric rings of WS2 with gaps in between.

Annelids like Pristina have bodies that are made up of a series of segments with a growth zone at the tail end which produces new segments continuously from two concentric rings of stem cells.