Wheeler's delayed choice double-slit experiment with detection screen in place and binocular telescopes (each pair aimed at the two slits)hidden behind the detection screen. The interference pattern (red bars) appears as expected.
<a href="//commons.wikimedia.org/wiki/User:Patrick_Edwin_Moran" title="User:Patrick Edwin Moran">Patrick Edwin Moran</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>