half the picture with a full head

optamists see the glass as half full, pessamists see the glass as half empty.

the pessamist gives value to the negative space; to the unseen, the absence of substance.

the optamist gives value to the seen substance; what can be tasted, touched, and otherwise verified with their senses.

half the glass is full, the other half is empty. 

so why do pessamists get a bad rap for giving the other side of the picture? 

without the negative spaces, half the image is missing. one cannot fully appreciate substance until one understands it's absence.