Floating elements should be avoided. The point where one element butts into another should always receive additional anchoring. For example, columns butt into the floor below them and the entablature above them. Their anchors are their base and capital. It is true that early Greek Doric columns lacked a base. However, this was corrected in the later Ionic and Corinthian orders and in the Roman Doric variant (for more information on the five orders see Orders and Their Dimensions).
Entablatures or beams that return into a wall should be anchored with an engaged column, pilaster, or corbel. Meanwhile, corbels themselves and modillions should also be anchored by trim around their top.
Without additional anchoring, elements appear to be floating and give the impression they could slip with respect to each other. Anchors connect the two elements and ensure they appear fixed fast to one another.
Corbels and modillions are shown below, anchored by continuous trim running around their tops. This trim connects them to the building ensuring they do not appear to be stuck on as an afterthought.
Below, the beam supporting the organ in St. Peter’s cathedral, Adelaide is anchored by a corbel on either end.
Additionally, cantilevered elements should be avoided. For example, beams should be supported at both ends, and balconies should be supported by corbels or other brackets.
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