This is a representation of the mihrab jali screen at the center of the front center iwan at Humayun's Tomb that bathes the symbolic tomb with light in the shape of the mihrab.
<a href="//commons.wikimedia.org/wiki/User:BilliTheCat" title="User:BilliTheCat">Nina Garman</a>
<span class="int-own-work" lang="en">Own work</span>