Vascular blemishes are reduced by directing pulsed laser radiation to converge toward the blemishes in a plurality of directions, each beam of radiation being derived from a primary radiation source or from a separate radiation source, thereby to cause selective thermolysis of blood vessels in the blemishes. Thus, it is possible to freely adjust the air gap between the fixed core and the movable core without preparing several types of connecting members. The side wall of each depression pattern is at an angle of 30-120 with respect to the first substrate. The server forwards at least some of the received messages to a projector, which in turn projects the messages to the display screen as posts within a social network \u201cpage\u201d.