Antique glass door knob is used in the 7 creative design strategies. Here's a look at the way I see designs.

Top row left to right: Combinations-Fire and Ice, Change of Context of environment- Put a ring on it, Juxtaposition- Tutu of glass, Metaphor/Simile- Diamond inspection

Bottom row left to right: Isolation- Tulips are better than none, Physical shape similarity- Let your light shine, Material change, swap, or focus- New meaning to a glass eye,