Yet only “Gray Tree” has scale-invariant branch diameters. When Mondrian removes the scale invariance in “Blooming Apple Tree ...

Readers’ photos celebrate sunrises and sunsets, when the light is the most pleasing. Fifty-one photos were sent in; here are the top picks.

With all that's going on in the world right now, it's sometimes nice to take a break and focus on the good stuff. So, we ...