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@HansMichielscom Thx-->. I invite you to view: "Magical square between 17-sided polygons (Gauss)". Artwork of Rivismo (© Ramón Rivas / Spain). #rivismo #art #RamónRivas #PinceladasExperienciales #innovation #creativity #Gauss #DataVault #Kimball #DataWarehouseAutomation #Ultrech