The main thing that I found show very fine detail in them such as in his wood work on staircases in the Bartlett Yancey House and the Bass House.
This is the Central Hall Staircase in the Bartlett Yancey House.
This shows the fine detail he puts into making the stair brackets for the Bass House.
The above picture shows the the Parlor Niche, Bartlett Yancey House. It creates a bold 3D effect that energizes the parlor.
Source: Thomas Day: Master Craftsman and Free Man of Color by Patricia Phillips Marshall and Jo Ramsay Leimenstoll.