Picture Riddle : Can you find the hidden key in the picture?

Can you locate the key?
Riddle Question

Can you find the hidden key in the picture below?

Can you locate the key?
Solve this math problem to see answer.
Riddle Answer

It's in the beer mug.
answer of the riddle

It belongs to Illusions category and tagged with brain illusions brain teasers optical illusions 90% fail to answer eye test visualization test picture riddle