FIG. 3.

Photographs illustrating the movement of the pen tip and alginate droplet toward the CaCl₂ solution. The time sequence shown represents sequential frames illustrating the compression of the alginate droplet against the surface of the CaCl₂ solution as the pen drops at a rate of 5 mm/sec. In the last frame the droplet has detached from the pen tip forming a spheroid. The spheroid in the CaCl₂ solution is identified with arrowheads.