But Rohmer just sat and watched, his face a blank mask.

His face is the blank mask of a man for whom duty is life.

He kept his identity concealed most of the time with a blank mask.

His face was a blank mask as he said slowly, "No.

Data's fellow officers stood by as his face drained of outside awareness and became a blank mask.

This blank mask did not help me to find the right words.

Panic had frozen the child's face into a blank mask, identical in three pictures.

Then the expression on her face slowly vanished, replaced by a blank mask.

The smooth blank mask that she usually wore lay beside her on the table.

Hannah's eyes clouded for a moment, her face became a blank mask again.