The characters 來 (lái; come) and 麥 (mài; wheat) have a rather unusual story behind them.
來 was originally a pictograph of a stalk of wheat.
麥 is the same thing but with the 夊 (foot; walking) component at the bottom.
In ancient Chinese both of these characters were pronounced almost identically: 來 /*m·rɯːɡ/ and 麥 /*mrɯːɡ/.
It seems like these characters should be the opposite of what they are: “wheat” should be a picture of wheat (來), and “come” should have the walking component (夊). At some point in history this may have been the case, but since “come” is a much more common word, it was preferable to represent it with the simpler character, and represent the less common “wheat” with the more complex character.
The simplified characters 来 and 麦 were derived from the cursive (草书) forms of 來 and 麥:
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