Knife edge profiles are perfect for floating ceilings as the sharp, angled edge is much more seamless than a bulky 90 degree edge.
Available in 45 and 30 degrees the sharper angle truly gives the impression of an invisible edge, particularly for lower ceiling.

Here are some examples of knife edge profiles, a few are also ‘double folded’ which is useful for ceiling coffers, can allow for strip lighting or to provide thicker edges.