His expression was curiously blank, as if masking an emotion he didn't want me to see.

Amazed, the Terrans looked at her, their eyes curiously blank.

Silk eyed me a long moment, her expression curiously blank.

It was a curiously blank and empty place.

My mind was curiously blank as I headed into horse country.

In time, he drifted off to sleep, and I sat there watching him, my mind curiously blank.

He noticed, remotely, that his hands were shaking, but he felt curiously blank.

Then Tarrant saw that her eyes, though focused, were curiously blank.

When he looked up, his eyes curiously blank, she mentally appreciated the picture he made.