If you found the imaginative vignettes of alternate realities in Einstein's Dreams compelling, you'll love Sum. Eagleman presents forty short tales envisioning possible afterlives, each with its own playful logic and philosophical twist. Like Lightman, he uses brief, poetic pieces to explore the nature of existence, time, and self, inviting you to ponder what it means to be alive.

If the fragmented, dreamlike structure of Einstein's Dreams fascinated you, The Mezzanine will delight you with its playful approach to time and memory. Following Howie on his lunch break, Baker's novel takes you on digressions and footnotes that spiral through past and present, creating a mosaic of moments that echo Lightman's imaginative leaps through possibility.

If you were drawn to the existential questions and philosophical musings in Einstein's Dreams, Kundera's The Unbearable Lightness of Being offers a similarly reflective experience. Through the intertwining lives of Tomas, Tereza, and Sabina, Kundera examines fate, chance, and the passage of time in a meditative, lyrical style.

If the imaginative treatment of time in Einstein's Dreams captivated you, Slaughterhouse-Five offers another unforgettable take. Billy Pilgrim becomes 'unstuck in time,' reliving moments from his life in a nonlinear fashion, blending dream, reality, and history in a manner that echoes Lightman's poetic meditations.

If you enjoyed the experimental format and sense of wonder in Einstein's Dreams, Calvino's If on a winter's night a traveler will intrigue you. The book is a metafictional puzzle, inviting you, the Reader, on a journey through beginnings of different stories and constantly shifting perspectives. Its inventive approach to narrative will appeal to your love of literary playfulness.