diff --git a/crates/re_viewer/src/ui/data_ui/image.rs b/crates/re_viewer/src/ui/data_ui/image.rs
index bb3d5a483548..63d5a67130b3 100644
--- a/crates/re_viewer/src/ui/data_ui/image.rs
+++ b/crates/re_viewer/src/ui/data_ui/image.rs
@@ -366,7 +366,7 @@ pub fn show_zoomed_image_region(
                                         .class_description(Some(ClassId(u16_val)))
                                         .annotation_info()
                                         .label(None)
-                                        .unwrap_or_default(),
+                                        .unwrap_or_else(|| u16_val.to_string())
                                 );
                                 ui.end_row();
                             };
diff --git a/examples/python/segment_anything/.gitignore b/examples/python/segment_anything/.gitignore
new file mode 100644
index 000000000000..0447b0d4ac3a
--- /dev/null
+++ b/examples/python/segment_anything/.gitignore
@@ -0,0 +1 @@
+model/
diff --git a/examples/python/segment_anything/main.py b/examples/python/segment_anything/main.py
new file mode 100755
index 000000000000..ad2069840f54
--- /dev/null
+++ b/examples/python/segment_anything/main.py
@@ -0,0 +1,210 @@
+#!/usr/bin/env python3
+"""
+Example of using Rerun to log and visualize the output of segment-anything.
+
+See: [segment_anything](https://segment-anything.com/).
+
+Can be used to test mask-generation on one or more images. Images can be local file-paths
+or remote urls.
+
+Exa:
+```
+# Run on a remote image:
+python main.py https://raw.githubusercontent.com/facebookresearch/segment-anything/main/notebooks/images/dog.jpg
+
+# Use cuda and a different model on a local image
+python main.py --device cuda --model vit_h /path/to/my_image.jpg
+```
+"""
+
+
+import argparse
+import logging
+import os
+from pathlib import Path
+from typing import Final
+from urllib.parse import urlparse
+
+import cv2
+import numpy as np
+import requests
+import rerun as rr
+import torch
+import torchvision
+from cv2 import Mat
+from segment_anything import SamAutomaticMaskGenerator, sam_model_registry
+from segment_anything.modeling import Sam
+from tqdm import tqdm
+
+MODEL_DIR: Final = Path(os.path.dirname(__file__)) / "model"
+MODEL_URLS: Final = {
+    "vit_h": "https://dl.fbaipublicfiles.com/segment_anything/sam_vit_h_4b8939.pth",
+    "vit_l": "https://dl.fbaipublicfiles.com/segment_anything/sam_vit_l_0b3195.pth",
+    "vit_b": "https://dl.fbaipublicfiles.com/segment_anything/sam_vit_b_01ec64.pth",
+}
+
+
+def download_with_progress(url: str, dest: Path) -> None:
+    """Download file with tqdm progress bar."""
+    chunk_size = 1024 * 1024
+    resp = requests.get(url, stream=True)
+    total_size = int(resp.headers.get("content-length", 0))
+    with open(dest, "wb") as dest_file:
+        with tqdm(
+            desc="Downloading model", total=total_size, unit="iB", unit_scale=True, unit_divisor=1024
+        ) as progress:
+            for data in resp.iter_content(chunk_size):
+                dest_file.write(data)
+                progress.update(len(data))
+
+
+def get_downloaded_model_path(model_name: str) -> Path:
+    """Fetch the segment-anything model to a local cache directory."""
+    model_url = MODEL_URLS[model_name]
+
+    model_location = MODEL_DIR / model_url.split("/")[-1]
+    if not model_location.exists():
+        os.makedirs(MODEL_DIR, exist_ok=True)
+        download_with_progress(model_url, model_location)
+
+    return model_location
+
+
+def create_sam(model: str, device: str) -> Sam:
+    """Load the segment-anything model, fetching the model-file as necessary."""
+    model_path = get_downloaded_model_path(model)
+
+    logging.info("PyTorch version: {}".format(torch.__version__))
+    logging.info("Torchvision version: {}".format(torchvision.__version__))
+    logging.info("CUDA is available: {}".format(torch.cuda.is_available()))
+
+    logging.info("Building sam from: {}".format(model_path))
+    sam = sam_model_registry[model](checkpoint=model_path)
+    return sam.to(device=device)
+
+
+def run_segmentation(mask_generator: SamAutomaticMaskGenerator, image: Mat) -> None:
+    """Run segmentation on a single image."""
+    rr.log_image("image", image)
+
+    logging.info("Finding masks")
+    masks = mask_generator.generate(image)
+
+    logging.info("Found {} masks".format(len(masks)))
+
+    # Log all the masks stacked together as a tensor
+    # TODO(jleibs): Tensors with class-ids and annotation-coloring would make this much slicker
+    mask_tensor = (
+        np.dstack([np.zeros((image.shape[0], image.shape[1]))] + [m["segmentation"] for m in masks]).astype("uint8")
+        * 128
+    )
+    rr.log_tensor("mask_tensor", mask_tensor)
+
+    # Note: for stacking, it is important to sort these masks by area from largest to smallest
+    # this is because the masks are overlapping and we want smaller masks to
+    # be drawn on top of larger masks.
+    # TODO(jleibs): we could instead draw each mask as a separate image layer, but the current layer-stacking
+    # does not produce great results.
+    masks_with_ids = list(enumerate(masks, start=1))
+    masks_with_ids.sort(key=(lambda x: x[1]["area"]), reverse=True)  # type: ignore[no-any-return]
+
+    # Work-around for https://github.com/rerun-io/rerun/issues/1782
+    # Make sure we have an AnnotationInfo present for every class-id used in this image
+    # TODO(jleibs): Remove when fix is released
+    rr.log_annotation_context(
+        "image",
+        [rr.AnnotationInfo(id) for id, _ in masks_with_ids],
+        timeless=False,
+    )
+
+    # Layer all of the masks together, using the id as class-id in the segmentation
+    segmentation_img = np.zeros((image.shape[0], image.shape[1]))
+    for id, m in masks_with_ids:
+        segmentation_img[m["segmentation"]] = id
+
+    rr.log_segmentation_image("image/masks", segmentation_img)
+
+    mask_bbox = np.array([m["bbox"] for _, m in masks_with_ids])
+    rr.log_rects("image/boxes", rects=mask_bbox, class_ids=[id for id, _ in masks_with_ids])
+
+
+def is_url(path: str) -> bool:
+    """Check if a path is a url or a local file."""
+    try:
+        result = urlparse(path)
+        return all([result.scheme, result.netloc])
+    except ValueError:
+        return False
+
+
+def load_image(image_uri: str) -> Mat:
+    """Conditionally download an image from URL or load it from disk."""
+    logging.info("Loading: {}".format(image_uri))
+    if is_url(image_uri):
+        response = requests.get(image_uri)
+        response.raise_for_status()
+        image_data = np.asarray(bytearray(response.content), dtype="uint8")
+        image = cv2.imdecode(image_data, cv2.IMREAD_COLOR)
+    else:
+        image = cv2.imread(image_uri, cv2.IMREAD_COLOR)
+
+    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
+    return image
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(
+        description="Run the Facebook Research Segment Anything example.",
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+    )
+    parser.add_argument(
+        "--model",
+        action="store",
+        default="vit_b",
+        choices=MODEL_URLS.keys(),
+        help="Which model to use." "(See: https://github.com/facebookresearch/segment-anything#model-checkpoints)",
+    )
+    parser.add_argument(
+        "--device",
+        action="store",
+        default="cpu",
+        help="Which torch device to use, e.g. cpu or cuda. "
+        "(See: https://pytorch.org/docs/stable/tensor_attributes.html#torch.device)",
+    )
+    parser.add_argument(
+        "--points-per-batch",
+        action="store",
+        default=32,
+        type=int,
+        help="Points per batch. More points will run faster, but too many will exhaust GPU memory.",
+    )
+    parser.add_argument("images", metavar="N", type=str, nargs="*", help="A list of images to process.")
+
+    rr.script_add_args(parser)
+    args = parser.parse_args()
+
+    rr.script_setup(args, "segment_anything")
+    logging.getLogger().addHandler(rr.LoggingHandler("logs"))
+    logging.getLogger().setLevel(logging.INFO)
+
+    sam = create_sam(args.model, args.device)
+
+    mask_config = {"points_per_batch": args.points_per_batch}
+    mask_generator = SamAutomaticMaskGenerator(sam, **mask_config)
+
+    if len(args.images) == 0:
+        logging.info("No image provided. Using default.")
+        args.images = [
+            "https://raw.githubusercontent.com/facebookresearch/segment-anything/main/notebooks/images/truck.jpg"
+        ]
+
+    for n, image_uri in enumerate(args.images):
+        rr.set_time_sequence("image", n)
+        image = load_image(image_uri)
+        run_segmentation(mask_generator, image)
+
+    rr.script_teardown(args)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/examples/python/segment_anything/requirements.txt b/examples/python/segment_anything/requirements.txt
new file mode 100644
index 000000000000..9c0dfad84fa8
--- /dev/null
+++ b/examples/python/segment_anything/requirements.txt
@@ -0,0 +1,8 @@
+-e git+https://github.com/facebookresearch/segment-anything.git#egg=segment-anything
+numpy
+opencv-python
+requests
+rerun-sdk
+torch
+torchvision
+tqdm