In addition to what everyone else is saying, the creators (I feel bad calling them developers, since they were designers, developers, artists and sound engineers) of those games were fucking wizards of artifact reuse.
Like the bushes in Mario are just recolored clouds. This blew my fucking mind when it was first pointed out to me.
https://1.bp.blogspot.com/-_a_oggyx9pU/VLhDiXqX5oI/AAAAAAAACeI/7xtotE-fqs0/s1600/mario%2Bbushes.png
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