DRAW coaster - repetitive bumps

This generously sized patterned coaster is just shy of four inches in diameter which makes it more useful.  It's also solid which means it will be more effective at holding moisture or spills.  The pattern is created with sine waves interacting in the x and y dimensions.  The  coaster has the same pattern on both sides making them interchangeable.  You can use either side when sipping on your beverage.

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