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The intricate banners, composed of grids of stylized letters and symbols, come from a series entitled Habitat Pixel, which is inspired by a virus that invaded Bonifacho's computer.

Rather than frustration, Bonifacho was seized with fascination when "the whole screen jammed with numbers and pixels."

The final works look cryptic, and they are: Bonifacho said the banners are encoded with secret messages.

"But I'm never going to reveal it," he said with a laugh.

"It could be Latin, it could be French. It could be Chinese."

At Tuesday's unveiling, Mayor Sam Sullivan presented Bonifacho with a $1,500 honorarium and thanked him for creating "a visual feast for the pure enjoyment of the public."

The tradition of Vancouver street banners dates back to the B.C. Centenary in 1958, when a team spruced up the city by flying banners as well as stringing strands of dogwood blossoms over Granville and Hastings streets and floated a dragon on Lost Lagoon.

Jack Shadbolt, Tony Onley, Gordon Smith and Bill Reid are among the artists whose works have been displayed on the banners over the years.