Illusion: Find the hidden horse in 5 secs

Optical illusions challenge our brains and perception, using hints like depth, shading, lighting, and position to interpret what we see. An image puzzle has been baffling netizens, showing a squirrel and a hidden horse which must be spotted in just 5 seconds. Those who are eagle-eyed and have sharp concentration are likely to find the horse in time.
http://dlvr.it/Stm5R8