His 1911 work “De Grijze Boom” (“The Gray Tree”) shows a series of black lines against a gray background, but the painting is nonetheless instantly recognizable as a tree, with its branch ...

Without realistic scaling, would this painting even be a tree? As if to prove the point, Mondrian made a subsequent painting the following year, also with a gray background, curved lines and the ...

In the wild, frog romance is a raucous affair. When it’s time to mate, the female eastern gray tree frog makes her way to the pond, when there could be hundreds of potential suitors each calling ...