The tunnel leads from an older to newer part of Amsterdam. The artwork doesn't run the entire length of the tunnel: toward the entrance/exit to the newer neighborhood, the tiles become a gradually darker field of blue (seen here, at left).

In addition to grabbing biker's attention and urging them to slow down, the architects write that the tunnel's change from "drawn lines [to] pixels also visualizes the transition in art from the old to the new."  Photo 4 of 5 in 80,000 Delft Blue Tiles Makes this the Most Dutch Design Ever by Zach Edelson

80,000 Delft Blue Tiles Makes this the Most Dutch Design Ever

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The tunnel leads from an older to newer part of Amsterdam. The artwork doesn't run the entire length of the tunnel: toward the entrance/exit to the newer neighborhood, the tiles become a gradually darker field of blue (seen here, at left).

In addition to grabbing biker's attention and urging them to slow down, the architects write that the tunnel's change from "drawn lines [to] pixels also visualizes the transition in art from the old to the new."