| In effect, it is a simple executable for loading onto your Pocket PC that provides an optical illusion, impressive enough until you recognise it. |
| The optical illusion will reverse itself when you look at your own actions. |
| Such veining creates an optical illusion of movement, which gives much character to this mantel. |
| Another optical illusion that causes umpires to make mistakes is the parallax error. |
| For others, it is only one optical illusion or an effect of our imagination. |
| This is a fascinating optical illusion device and just the sort of scientific curiosity we love. |
