diff --git a/visions/server/src/asset_db.rs b/visions/server/src/asset_db.rs
index 23a7a4d..d32fa82 100644
--- a/visions/server/src/asset_db.rs
+++ b/visions/server/src/asset_db.rs
@@ -5,6 +5,7 @@ use std::{
 };
 
 use mime::Mime;
+use serde::{Deserialize, Serialize};
 use thiserror::Error;
 
 #[derive(Debug, Error)]
@@ -30,7 +31,7 @@ impl From<std::io::Error> for Error {
     }
 }
 
-#[derive(Clone, Debug, Hash, Eq, PartialEq)]
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub struct AssetId(String);
 
 impl Display for AssetId {
diff --git a/visions/server/src/core.rs b/visions/server/src/core.rs
index aac0c15..d5bcaf0 100644
--- a/visions/server/src/core.rs
+++ b/visions/server/src/core.rs
@@ -15,6 +15,12 @@ use crate::{
     types::{AppError, Message, Tabletop, RGB},
 };
 
+const DEFAULT_BACKGROUND_COLOR: RGB = RGB {
+    red: 0xca,
+    green: 0xb9,
+    blue: 0xbb,
+};
+
 #[derive(Debug)]
 struct WebsocketClient {
     sender: Option<UnboundedSender<Message>>,
@@ -39,11 +45,7 @@ impl Core {
             asset_db: Box::new(assetdb),
             clients: HashMap::new(),
             tabletop: Tabletop {
-                background_color: RGB {
-                    red: 0xca,
-                    green: 0xb9,
-                    blue: 0xbb,
-                },
+                background_color: DEFAULT_BACKGROUND_COLOR,
                 background_image: None,
             },
         })))
@@ -112,10 +114,10 @@ impl Core {
             .collect()
     }
 
-    pub fn set_background_image(&self, path: String) -> Result<(), AppError> {
+    pub fn set_background_image(&self, asset: AssetId) -> Result<(), AppError> {
         let tabletop = {
             let mut state = self.0.write().unwrap();
-            state.tabletop.background_image = Some(path.clone());
+            state.tabletop.background_image = Some(asset.clone());
             state.tabletop.clone()
         };
         self.publish(Message::UpdateTabletop(tabletop));
@@ -187,4 +189,23 @@ mod test {
             assert_eq!(data, "abcdefg".as_bytes());
         });
     }
+
+    #[tokio::test]
+    async fn it_can_retrieve_the_default_tabletop() {
+        let core = test_core();
+        assert_matches!(core.tabletop(), Tabletop{ background_color, background_image } => {
+            assert_eq!(background_color, DEFAULT_BACKGROUND_COLOR);
+            assert_eq!(background_image, None);
+        });
+    }
+
+    #[tokio::test]
+    async fn it_can_change_the_tabletop_background() {
+        let core = test_core();
+        assert_matches!(core.set_background_image(AssetId::from("asset_1")), Ok(()));
+        assert_matches!(core.tabletop(), Tabletop{ background_color, background_image } => {
+            assert_eq!(background_color, DEFAULT_BACKGROUND_COLOR);
+            assert_eq!(background_image, Some(AssetId::from("asset_1")));
+        });
+    }
 }
diff --git a/visions/server/src/handlers.rs b/visions/server/src/handlers.rs
index bf94976..ae31f61 100644
--- a/visions/server/src/handlers.rs
+++ b/visions/server/src/handlers.rs
@@ -143,7 +143,7 @@ pub async fn handle_connect_websocket(
 
 pub async fn handle_set_background_image(core: Core, image_name: String) -> impl Reply {
     handler(async move {
-        let _ = core.set_background_image(image_name);
+        let _ = core.set_background_image(AssetId::from(image_name));
 
         Ok(Response::builder()
             .header("Access-Control-Allow-Origin", "*")
diff --git a/visions/server/src/types.rs b/visions/server/src/types.rs
index f47a25b..f5c5307 100644
--- a/visions/server/src/types.rs
+++ b/visions/server/src/types.rs
@@ -2,6 +2,8 @@ use serde::{Deserialize, Serialize};
 
 use typeshare::typeshare;
 
+use crate::asset_db::AssetId;
+
 #[derive(Debug)]
 pub enum AppError {
     NotFound(String),
@@ -10,7 +12,7 @@ pub enum AppError {
     UnexpectedError(String),
 }
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, PartialEq, Serialize)]
 #[serde(rename_all = "camelCase")]
 #[typeshare]
 pub struct RGB {
@@ -24,7 +26,7 @@ pub struct RGB {
 #[typeshare]
 pub struct Tabletop {
     pub background_color: RGB,
-    pub background_image: Option<String>,
+    pub background_image: Option<AssetId>,
 }
 
 #[derive(Clone, Debug, Deserialize, Serialize)]