diff --git a/.emacs.d/lisp/package-cl-inspect-mode.el b/.emacs.d/lisp/package-cl-inspect-mode.el
new file mode 100644
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+++ b/.emacs.d/lisp/package-cl-inspect-mode.el
@@ -0,0 +1,42 @@
+;; TODO: Name?  cl-inspect?  clinspect?  clidget?  eclidget?
+;; Actually, make it independent of CL.
+;; TODO: Better table abstraction?
+;; Maybe https://github.com/kiwanami/emacs-ctable?
+
+(require 'cl-lib)
+
+(defun clinspect--tabulated-list-format (header _data)
+  ;; TODO: Use data to compute the column size.
+  (apply #'vector (mapcar (lambda (column)
+                            (list column 12 t . nil))
+                          header)))
+
+(define-derived-mode clinspect-mode tabulated-list-mode "Clinspect"
+  "Mode to inspect Common Lisp sequences."
+  ;; (setq tabulated-list-padding 2)
+  ;; (setq tabulated-list-sort-key (cons "Size" 'flip))
+  ;; (setq tabulated-list-printer #'disk-usage--print-entry)
+  (add-hook 'tabulated-list-revert-hook 'tabulated-list-init-header nil t))
+
+(defvar clinspect-buffer-name "clinspector")
+
+;; Input:
+;; - header: list of strings
+;; - ddata: list of list of things.
+(defun clinspect (header data &optional name)
+  "Inspect DATA."
+  (switch-to-buffer
+   (generate-new-buffer (format "*%s%s*" clinspect-buffer-name
+                                (if name
+                                    (format "<%s>" name)
+                                  ""))))
+  (clinspect-mode)
+  (setq tabulated-list-entries
+        (cl-loop for line in data
+                 for index from 1 upto (length header)
+                 collect (list index (apply #'vector (mapcar #'prin1-to-string line)))))
+
+  (setq tabulated-list-format (clinspect--tabulated-list-format header data))
+  (tabulated-list-revert))
+
+(provide 'clinspect)