As in Armstrong (2016) and Edison (2018), Kuhlmann employs a mix of narrative and fantastically detailed mouse’s-eye-view pencil-and-watercolor scenes to portray a small, furry investigator intrepidly tackling scientific and technological challenges in a human-sized world—here involving old records in a certain Swiss patent office, clock gears and computer parts, trial and error, and equations on chalkboards.
Kirkus Reviews, Starred Review

His unique ability to combine fun, facts, science and biography makes Einstein a real triumph.
BookPage, Starred Review

Time is relative, size doesn’t matter, and kindred spirits can be located past and present when it comes to determination, wanderlust, curiosity, and big ideas.
School Library Journal

Kuhlmann’s cinematic artwork makes exquisite use of light and saturated colors, and he mixes detailed panels with full-page spreads. Robust back matter offers more details on Einstein’s life and explanations of his most famous theories (with the help of mice, of course)...
Booklist

Along with an inventive plot and richly drawn characters are Kuhlmann’s highly detailed graphics...
Publisher's Weekly

The story is a primer on Einstein’s theories and discoveries, and it prompts discussion on the nature of time itself.
Danielle Ballantyne, Foreword

If you’ve never seen a Kuhlmann book, you are in for a treat. I’ve always called him the Steampunk Beatrix Potter, but to be fair he’s more interesting than that. Over the years Kuhlmann’s books have charmed with their precision and attention to even the smallest of details. And now, at long last, we’re gonna get to see some time travel.
Betsy Bird, Fuse #8 Blog, SLJ.com

Kuhlmann’s books about mice and historical figures—we’ve met Lindbergh, Armstrong, and Edison before—are beautifully illustrated and incredibly detailed.
GeekDad

Kuhlmann’s intriguing large-scale mechanical drawings counterpoint the mouse’s tiny size.
Charles Sutton, Vermont Country Sampler