Ubiquitous (adj.) – existing or being everywhere at the same time : constantly encountered. (merriam-webster.com)
I came across this word in the Ways of Seeing text on page 32 where it describes art. It says “For the first time ever, images of art have become ephemeral, ubiquitous, insubstantial, available, valueless, free.” I understand now from the definitions and the context clues in the sentence that ubiquitous means “open” or “surrounding”.