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 The challenge was to design a vertical structure on the island of Cotonduba that in addition to serving as an observation tower would become a symbol of welcome to newcomers in Rio either by sea or by air once it has been host city of 2016 Olympic Games. Designed by RAFA firm headquartered in Zurich , Switzerland , it is called ” Solar City Tower , this structure was chosen in response to the

Don't stare too long or you get dizzy..Just answer which disc is turning faster, A or B? My guess goes on B! This works in a same way “Rotating Snakes” and “Rotating Snakes no.2″ Illusions work.Related articlesOptical Illusion of the Week: "Snakes, Ladybugs and Flowers" (psychworld.com)Studying how snakes got legless (bbc.co.uk)Finally Joel saw a snake! - Orlando, FL (travelpod.com)Good reasons