"When a force coming from without moves the point in any direction, the first type of line results; the initial direction remains unchanged, and the line has the tendency to run in a straight course to infinity."
the simple curved line is really "a straight line which has been brought out of its course by constant sideward pressure — the greater was this pressure, the farther went the diversion from the straight line"
POINT AND LINE TO PLANE
FIRST PUBLISHED IN 1926 UNDER THE TITLE OF PUNKT UND L1NIE ZU FLACHE
THE NINTH IN THE SERIES OF FOURTEEN BAUHAUS BOOKS EDITED BY WALTER GROPIUS AND L. MOHOLY-NAGY