  We investigate classical solutions of string field theory proposed by
Takahashi and Tanimoto in the case of even order polynomial functions. The BRS
charge and the Feynman propagator of open string field theory expanded around
the solution are specified by Jenkins-Strebel quadratic differential, which
describes geometry of the string worldsheet. We show that the solution becomes
nontrivial when two second order poles of the quadratic differential coincide
each other on the unit disk. In this case, an open string boundary shrinks to a
point.
