Do you know the symbolism behind the Tulsa flag design? The blue represents the Arkansas River. The gold line represents the discovery of "black gold" (oil) that has led to economic prosperity and resulting philanthropy to develop the city. The shield pays homage to the Oklahoma state flag, which displays the Osage shield to represent the indigenous tribes forcefully relocated to the Indian territory within our state. The red circle represents the blood of the victims of the the Tulsa Race Massacre of 1921, one of the most deadly and violent incidents of racial violence in US history. The white star represents our city's bright future. Both the star and shield were designed in the Art Deco style, as Tulsa is a hotbed of this style of architecture. The beige lower field represents warmth and community. Protect your furniture from moisture with these amazing, durable waterstone coasters! They are freakishly absorbent for both hot and cold drinks, and the beautiful Tulsa in Ink artwork is fade resistant. To clean your coasters, prepare a solution of 3 parts hot water (not boiling) and 1 part bleach. Soak the coasters overnight. Rinse, lay flat with the cork-side up and allow to air dry. This process may be repeated to remove stubborn stains such as coffee, wine and cola.