日新月异 (rì xīn yuè yì) — (idiom) changing rapidly; making progress every day

A drawing of the thing itself, worn down over three thousand years into a few strokes.

日 originally drew the sun. A mark was added inside to tell it apart from similar square shapes.

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

假借jiǎjièLater borrowed for its sound alone — the picture has nothing to do with today’s meaning.

The shape originally paired 斤, for chopping wood, with 辛 for sound. It was borrowed for its sound to write 新, so the chopping-wood parts are unrelated to 'new'.

A drawing of the thing itself, worn down over three thousand years into a few strokes.

月 was drawn as a crescent moon, with the curved outline showing the moon’s shape.

Two or more meaningful parts placed together so that their meanings combine into a new one.

This origin belongs to the traditional form 異; 异 is its simplified writing.

The traditional form 異 depicts a person with a mask 田 over the face, so the face looks different. The simplified 异 is a later shorthand.