Recommended Reading
Recommended not because I agree with everything in them, but because they ask good questions, offer sharp perspectives, or complicate easy answers.
Linguistics
The Evolution of Grammar: Tense, Aspect, and Modality in the Languages of the World, by Joan L. Bybee, Revere Perkins, William Pagliuca
The New Psychology of Language: Cognitive and Functional Approaches to Language Structure, by Michael Tomasello
Usage-Based Models of Language, by Michael Barlow and Suzanne Kemmer
Analysing Sociolinguistic Variation, by Sali Tagliamonte
Regularity in Semantic Change, by Elizabeth C. Traugott and Richard B. Dasher
Modality in Grammar and Discourse, ed. by Joan L. Bybee and Suzanne Fleischman
Ethnosyntax: Explorations in Grammar and Culture, ed. by N. J. Enfield
The Spell of the Sensuous: Perception and Language in a More-Than-Human World, by David Abram
Other nonfiction
The Beak of the Finch: A Story of Evolution in Our Time, by Jonathan Weiner
A Certain Loneliness: A Memoir, by Sandra Gail Lambert
The Cosmic Serpent: DNA and the Origins of Knowledge, by Jeremy Narby
Caesar’s Last Breath: Decoding the Secrets of the Air Around Us, by Sam Kean
Stirring the Mud: On Swamps, Bogs, and Human Imagination, by Barbara Hurd
Quirks of the Quantum: Postmodernism and Contemporary American Fiction, by Samuel Coale
Distinction: A Social Critique of the Judgement of Taste, by Pierre Bourdieu
The Archaeology of Knowledge & The Discourse on Language, by Michel Foucault
The Transmission of Affect, by Teresa Brennan
An Environmental History of Northeast Florida, by James J. Miller
Bird Sense: What It’s Like to Be a Bird, by Tim Birkhead
Bullshit Jobs: A Theory, by David Graeber
Finding the Mother Tree: Discovering the Wisdom of the Forest, by Suzanne Simard
How to Hold a Cockroach: A book for those who are free and don’t know it, by Matthew Maxwell
Imagined Communities: Reflections on the Origin and Spread of Nationalism, by Benedict Anderson
Is a River Alive?, by Robert Macfarlane 
The Origins of Knowledge and Imagination, by Jacob Bronowski
Feh: A Memoir, by Shalom Auslander
The Mismeasure of Man, by Stephan Jay Gould
Man’s Search for Meaning, by Viktor E. Frankl
Walden, by Henry David Thoreau
When We Cease to Understand the World, by Benjamín Labatut
Reality is Not What it Seems: The Journey to Quantum Gravity, by Carlo Rovelli
Literature
A Psalm for the Wild-Built and A Prayer for the Crown-Shy, by Becky Chambers
The Appointment, by Herta Müller
The Covenant of Water, by Abraham Verghese
On Earth We’re Briefly Gorgeous, by Ocean Vuong
L’écume des jours, by Boris Vian (this one must be read in French)
Good Kings Bad Kings, by Susan Nussbaum
Immensités: Roman, by Sylvie Germain
La invención de Morel, by Adolfo Bioy Casares
Martin Marten, by Brian Doyle
Moderato Cantabile, by Marguerite Duras
Olive Kitteridge, by Elizabeth Strout
Open Throat, by Henry Hoke
The Overstory, by Richard Powers
Pachinko, by Min Jin Lee
A Pale View of Hills, by Kazuo Ishiguro
Le Petit Prince, by Antoine de Saint-Exupéry
Le Rivage des Syrtes, by Julien Gracq (this one must be read in French)
The River’s Memory, by Sandra Gail Lambert
A Tale for the Time Being, by Ruth Ozeki
Those Who Save Us, by Jenna Blum
The Three-Body Problem, by Cixin Liu
Three Men in a Boat, by Jerome K. Jerome
TransAtlantic, by Colum McCann
Trilogy: Molloy, Malone Dies, The Unnamable, by Samuel Beckett
The Unconsoled, by Kazuo Ishiguro
Where the Dogstar Never Glows, by Tara L. Masih
Xenogenesis Series (Dawn, Adulthood Rites, and Imago), by Octavia E. Butler