More than half of the Spanish Direct Object Pronouns look like the Spanish Indirect Object Pronouns
As you can see here:
DO Pronouns: me te lo/la nos los/las
IO Pronouns: me te le nos les
The DO pronouns have a male/female distinction in the third person singular and third person plural.
The IO pronouns use the gender neutral Le and Les for the third person.
I can make you remember this without a disturbing drawing.
Because the Independent Object is so independent, it uses LESs pronouns
How cool is that?