interesting Ganesh. To add. Shape you can perceive even with one eye. Incase of Form a lot of post processing is happening in the brain to combine two images.

I am yet to learn a lot here Ganesh. And I know my question cannot be answered here in text, but I must have looked at both the Form image and the Shape image multiple times, and I fail to see the difference apart from the obvious changes. But if you ask me why the top one is a Form and not a Shape I am not able to say. Can you point me towards the differentiating factors here between the two, if only it can be typed out that is, else I will wait for a few more decades to learn the differences

Harsha, the B&W posted above (as well as the color version below) has dimension while the B&W below does not. Isn't that evident ? May be it is not ?!