Transparency is infrequent in nature, but shadows are not. It is possible that the “laws” of perception we have explored so far evolved primarily to deal with shadows and to distinguish them ...

In the museum’s main foyer, four wall-mounted cubes cast shadows on the wall, revealing a juxtaposition between the hard steel and the soft overlapping shadows.

The last time three moon shadows appeared simultaneously on Jupiter was in 2013 but the next one won't be happening until 2032. The Griffith Observatory in Los Angeles held a viewing activity for ...