A shaft of morning sunlight angled its way through the bare trees and illuminated a clump of leaves. And there they were, two crocus buddies. They are the sturdier, more colorful kind that come after the first wave of delicate "lawn crocuses" have appeared and faded on yellowed front lawns. I marveled at the range of palest lavender tones shading to rich purple at the tips. Those brilliant yellow stamens complete the complementary pairing of colors that signifies spring. Nature teaches us the ins and outs of the color wheel