Known for his enjoyment of philosophical puzzles, and for wearing only a vest no matter what the temperature.

The pole, which was just now shaking loose another muffin's worth of fruit, left me with something of a philosophical puzzle.

And there was a wealth of traditional fairy-stories whose appeal was grounded in philosophical puzzles.

Ludwig Wittgenstein wrote about the nature of philosophical puzzles and philosophical understanding.

Ms. Dill's sculptures are less visual objects for detached aesthetic contemplation than knotty philosophical puzzles that use sculpture as a launching pad.

The novel blends mystery, romance, and philosophical puzzles in a setting of 16th century Istanbul.

Thomson's lamp is a philosophical puzzle that is a variation on Zeno's paradoxes.

It's a philosophical puzzle worthy of Plato and Aristotle.

- the real world fades away and is replaced by the arid world of philosophical puzzles.

Some are more formal and others take mereological essentialism as solutions to philosophical puzzles or paradoxes.