The image is a great reminder how we create our world through interpretations made up of language and symbols. Our language and symbols are always incomplete versions of a greater reality. Here is why inquiry is such a powerful tool when compared to simple advocacy. Inquiry allows us to discover what might be outside the cave instead of arguing about the shadows on the wall.

The image and the costs of a Berlin-like wall or a Great Wall of China is something that the American people have not accepted to date.

As former Homeland Security Secretary Janet Napolitano pointed out, if you build a 50-foot wall, you'll soon be confronted with a 51-foot ladder. You need a strategy that involves layered defense: deployed patrols, sophisticated sensor equipment, and surveillance from the air. That is what has had a positive impact over the last generation.

I think there's no question that the barriers, the fences and in certain urban areas, the walls, have had an important effect in terms of increasing the manageability and the security of the border. But in fact as Secretary of Homeland Security General John Kelly acknowledged at his confirmation hearing, walls and barriers alone are insufficient to insure security.

Most people who live at the border or are familiar with the border know that a Berlin-like wall stretching from San Diego to Brownsville is not necessary. And the costs would be prohibitive. And there are places on the border, such as the Arizona desert or the open terrain around the Big Bend in South Texas, where Mother Nature has created her own barrier that is not easily passable. Or if you do pass through it, you are easily detected.

If you build a 50-foot wall, you'll soon be confronted with a 51-foot ladder.

Walls and barriers alone are insufficient to insure security.

Adaptation is always the same process for me, which is some version of throwing the book at the wall and seeing what pages fall out. It is trying to imagine, remember the story, read it, put it down, and then write sort of an outline without the book in front of you with some hope that what you like about it will be filtered and distilled out through your memory and then that will be similar to what other people like about it.

My definition of art has always been the same. It is about freedom of expression, a new way of communication. It is never about exhibiting in museums or about hanging it on the wall.

I went through about six or seven painting methods just to see what I didn't want to do. And then I got off the wall, and went into the environment.