Optical illusion: Can you spot the hidden horse in this pic in under 15 seconds?

This image contains a horse which you need to spot within 15 seconds of viewing time. The problem presents itself as a straightforward yet intelligent test, which requires viewers to locate the hidden horse. The initial view of the image shows nothing out of the ordinary, yet detailed observation of all areas and dark spots reveals a horse exists in the picture

Optical illusion: Can you spot the hidden horse in this pic in under 15 seconds?
This image contains a horse which you need to spot within 15 seconds of viewing time. The problem presents itself as a straightforward yet intelligent test, which requires viewers to locate the hidden horse. The initial view of the image shows nothing out of the ordinary, yet detailed observation of all areas and dark spots reveals a horse exists in the picture