// Creates a list based on a ratio
// Valid options for $start: 'large' or 'small'
@function ratio($ratio, $steps, $start: 'small') {
  $x: 1;
  $return: ();

  @for $i from 0 through $steps - 1 {
    $xr: $x * pow($ratio, $i);
    $return: append($return, $xr, comma);
  }

  @if $start == 'small' and $ratio < 1 {
    $return: reverse($return);
  }
  @else if $start == 'large' and $ratio > 1 {
    $return: reverse($return);
  }

  @return $return;
}