B) herman von helmholtz
The trichromatic color theory<span> began in the 18th century, when </span>Thomas Young<span> proposed that color vision was a result of three different </span>photoreceptor cells<span>. </span>Hermann von Helmholtz<span> later expanded on Young's ideas using color-matching experiments which showed that people with normal vision needed three wavelengths to create the normal range of colors. Physiological evidence for trichromatic theory was later given by </span>Gunnar Svaetichin<span> (1956).</span>
"Shape" is the one visual element of art among the following choices given in the question that was most used by the artist, in <span>this piece entitled modern painting with clef, by Roy Lichtenstein. The correct option among all the options that are given in the question is the fourth option or option "d". </span>
Answer:
A reed. Sometimes a double or single reed but it is a removable piece of bamboo.
Explanation:
It is an example of artists take elements from the environment to transform and represent their mood and messages.
