stone; CL:塊|块[kuai4]
石 · 5 strokes
Pictograph of a musical stone chime. The 口 component was added later as a meaningless decorative mark.
头 · 5 strokes
Phonosemantic compound. 頁 represents the meaning and 豆 represents the sound. The simplified character 头 was adapted from the cursive form of the traditional character 頭.