This demo includes three graphical display windows.

The window "Curve: X(t)" displays the curve X(t), the point X(t_{0}),
and the unit tangent and principal normal vectors T(t_{0}) and
P(t_{0}) with their tails at X(t_{0}).

The window "T(t) and P(t)" displays the unit tangent and principal normal
vectors T(t_{0}) and P(t_{0}) and the unit sphere on
which their heads are constrained to lie.

The window "k(t)" displays the graph of k(t).

You can change t_{0} and X(t) in the control window. The
control window
includes a list of functions that you can use for X(t), along with
parameters used to define those functions.

As in previous demos there is a "Show Color Spectrum" checkbox.