This is the first target; you remember, it's where the bubbles come from.

He stood a little longer, watching the bubbles come and go.

"It was like stepping on a carpet and a bubble came up," he said.

No one knew where these bubbles come from, or why there are there.

The time he held Conor's head under water until the bubbles came.

When the tool is perfectly level, or true, the bubble will come to rest between the two lines.

But bubbles came from the shielded opening which seemed to be a mouth.

More bubbles came from the round place like a mouth.

Now, however, the bubble has come to symbolize an agent for change.

Now and then a few bubbles from some unknown source came rising out of the depths.