In half the cookies (the «lids»), cut a small
circular hole in the middle (I used the lid of an olive oil bottle to do this)
The Great Blue Hole is
a circular hole in the middle of Lighthouse Reef Atoll.
Not exact matches
Notice that the shadow of the black
hole — a dark, nearly
circular shape
in the
middle of the images — is only clearly visible at high frequencies (230 GHz / 1.3 mm) at which EHT operates.
Sunset
in Pink (2012) is a thin, rectangular form with rounded edges, where a precise,
circular hole has been cut out near the
middle of a pink - tinted Amman limestone.