All-night testing continued this week on the High Roller observatory wheel at the Linq. The LED system is capable of alternating between showing the attraction in one solid color, or having colored sections (above). Other times, the colors race around the rim. The world's tallest observatory wheel (550 feet) is scheduled to open next month at The Linq, a $550 million makeover that includes restaurants and retail behind the former Imperial Palace, now known as The Quad. (Norm Clarke/Las Vegas Review-Journal)


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