''The Mysterious Alcove''

This is a variation on an earlier image. But... If you study itclosely you may notice that 'something' is 'not quite right'. Thestrangeness is intentional...

HINT: The answer is not in a tiny detail.

This is designed to be interesting at first view, but also to perplexthe perceptive. Can you find the answer?

Please let me know what you think of it... and the answer if you careto.

Thank you for your time and commentary.