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In Birmingham, Mr. Connor invited the Ku Klux Klan to meet one bus, giving the Klansmen free rein to maul the riders with iron pipes, bicycle chains and baseball bats.

Three were convicted of wearing face coverings, and carrying weapons that included a bicycle chain and sharpened PVC pipe — not of setting the door alight.

Prince Harry also said that, after Diana's death, he and his brother William were sat down in a room and told that the events leading to the car crash were "like a bicycle chain".

Nearby, the 1909 Wright brothers flier — the world’s first military airplane — still has oil stains on its fabric wings near the engine and the big bicycle chains that turned the propellers.

The six artists included all show a strong dedication to working across media and combining materials in surprising ways; one of Leilah Babirye’s sculptures includes washers, screws and bicycle chains.