The shaft is well shaped, with a moderate swelling (entasis).
The entasis was entirely decided by such optical considerations.
This is called the entasis of the spire, and belongs to the study of optics in architecture.
This peculiarity is a convexity, or entasis, as it is called, on the inner faces.
The powerful shafts were doubly modified by the diminution and by the entasis.
This entasis was surrounded by a row of leaves, again characterizing the ascending bundle as stems.
The Ionic column, thus made of greater proportional height, had diminution and entasis like the Doric.
Above them rise the columns, tapering gently as they ascend, but without any swell or entasis.
The entasis of columns and curvature of what would ordinarily be straight lines is familiar to all students of architecture.
The entasis is almost invariably introduced in the spires of English churches.