It's not the word PICTURE that serves as a FRAME for the theme answers, but rather a synonym ... Thank you, Zhouqin, for this enjoyable puzzle.

Water flow puzzles like the one above are a perfect ... At first glance, the answer may seem obvious—but don’t fall for the trick! Not all pipes are open, and some may block the flow completely.

If you are unable to solve the puzzle, you can check the answer below when time runs out. Amazing! If you spotted all the 6 words in this picture. However, if you are still looking for them ...