A National Geographic photograph captures donkeys casting zebra-like shadows ... We see a donkey and expect it to be a donkey. We see a shadow and expect it to be a simple outline.

His theory accurately replicates the observed "zebra" pattern ... casting a bigger shadow, while high frequencies create smaller shadows, resulting in different fringe spacing," Medvedev explained ...

His theory replicates the observed "zebra" pattern accurately ... casting a bigger shadow, while high frequencies create smaller shadows, resulting in different fringe spacing," Medvedev explained ...