Marco Rocks has always gone out of their way to provide some really unusual shapes for unique aquascaping choices, and this new product is the icing on the cake for some vertically challenged reefers.  Designed to create a column or pillar within your aquarium, these are perfect for elevating your acros, providing unique swimthroughs, and getting rock to fit into those tight corners (they have a square edge).  These new shapes are currently available in limited quantities and are going up on the website NOW.  Be sure to grab yours before they are gone.