I thought I’d post a site here that someone recently shared with me. It’s sort of a modern day Etch-A-Sketch for icebergs. There is a blank ocean where you etch-a-sketch in an iceberg to see how your shape would float.
Things to keep in mind: The sketch and canvas are only two-dimensional, an actual iceberg would be 3-D. An iceberg floats with 10% of its mass above water.
The site can be found here: