I really like aesedepece's One object, three geometric shadows (https://www.thingiverse.com/thing:22021) and it reminds me of a drafting challenge I was presented when I first started 3D model visualization and 2D drafting. Was asked to create the ISO view of the object using the Front, Top & Right Views. There are no hidden lines and the shapes on the front and top are unit squares.

Just like aesedepece, I have deleted the STL preview in order not to spoil it for you.
Can you guess how the object looks?