Today is MAR 10, aka Mario day. It is also extremely close to the spring equinox.
This implies a cycle of Wario Day (fall equinox), Luigi Day (summer solstice), and Waluigi Day (winter solstice).
Luigi's height and generosity represents the wheat stalk; when we feast upon the harvest we embody Wario's girth and greed.
Waluigi stands for the lean times that come during winter. As the snows melt he is replaced by Mario, whose plumber nature blesses the fixing of pipes that burst from the cold.