Computer generated image showing caustic lighting. HDRI reflections are visible on the crystal ball. This image was created to be used in a wikipedia article.
User <a href="https://en.wikipedia.org/wiki/User:T-tus" class="extiw" title="en:User:T-tus">T-tus</a> on <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>
CC BY 2.0
<a href="https://en.wikipedia.org/wiki/en:Image:Caustics.jpg" class="extiw" title="w:en:Image:Caustics.jpg">English Wikipedia</a>