So, our perception of things depends on the instrument of perception and not entirely on the object.
You say it is a cube; in fact, it is a hard cube made of wood. Imagine a human being, a strong man whose hand has the grip of a powerful vice. He can crush the cube in no time. So the solidity of it depends again on your strength or lack of it.
So, if touch cannot be a criteria for deciding the quality or shape of an object, we are again left with this uncertainty of saying, ‘How solid is it if viruses can go through it or bacteria can go through it?’ It’s solid to us, to our senses of perception. Yet, we know now that it is space that composes it mostly.
Now, let’s examine the characteristic of the cube’s size. Look at the size of the cube. You say, ‘Oh! This is a cube that is three inches wide on all six sides.’ These three inches is as you measure with the scale, but is size an absolute factor?
Let’s consider a very simple matter of perception. When you are a little child, your father appears huge to you. He is tall and big. As you grow up, you soon catch up with his height and sometimes, you exceed his height and he begins to look smaller than you. You thought he was big but now he looks smaller. So, what’s happened here? He is the same.
The cube is merely succumbing or acting according to the laws of gravity that is one of the laws of nature, like electricity.