Brainstorm or Green Needle

 Here is another great example of audio pareidolia:

This is another excellent illustration of how our brain seeks to find meaning and comprehensibility in ambiguous perceptual stimuli. This one is particularly surprising given how different the two potential sounds are. 

I cam across this one from the latest episode of The Skeptic's Guide to the Universe. 

Optical Illusions 2021

 Here is a great roundup of some of the best optical illusions of 2021. As always, the study of ways vision can be tricked and manipulated teach us a great deal about how our visual systems work. 

The 10 Best Illusions of the Year (gizmodo.com)