alias: is(filter, [context])
Returns true if at least one element in the collection satisfies the provided filter, which may be a CSS selector, function or element.
var shapes = Pablo(),
outcome;
shapes.add(Pablo.rect());
shapes.add(Pablo.rect());
shapes.add(Pablo.rect());
shapes.add(Pablo.circle()); // Change me
// Check if some elements are circles
outcome = shapes.some('circle');
alert(outcome);