How to paint ceiling edges<br>Apply some blue painter's tape to the walls where they meet the ceiling. The tape will help protect the walls from drips or from accidental smears. Press the tape down on the wall as tightly as possible to keep any excess paint from leaking in behind it.
You will be glad you took the extra step of applying painter's tape.
Because the tape helps protect the walls from drips or from accidental smears, it saves you from a bad result. Thus you will be glad you took the extra step. This logical inference fooled the model.