diff --git a/collage/collage.go b/collage/collage.go
new file mode 100644
index 0000000..95e6018
--- /dev/null
+++ b/collage/collage.go
@@ -0,0 +1,36 @@
+// Package collage makes a pic collage
+package collage
+
+import (
+	"io"
+	"io/fs"
+)
+
+type Dimension struct {
+	Width  uint `json:"width"`
+	Height uint `json:"height"`
+}
+
+type Point struct {
+	X uint `json:"x"`
+	Y uint `json:"y"`
+}
+
+type Rectangle struct {
+	Start Point `json:"start"`
+	End   Point `json:"end"`
+}
+
+type Request struct {
+	BackgroundImage string    `json:"background_image"`
+	Aspect          Dimension `json:"aspect"`
+	Dimension       Dimension `json:"dimension"`
+	Photos          []struct {
+		ImageName string    `json:"image"`
+		Crop      Rectangle `json:"crop"`
+		Frame     Rectangle `json:"frame"`
+	} `json:"photos"`
+}
+
+func Make(request Request, source fs.FS, output io.Writer) {
+}
diff --git a/collage/collage_test.go b/collage/collage_test.go
new file mode 100644
index 0000000..e9ba6a4
--- /dev/null
+++ b/collage/collage_test.go
@@ -0,0 +1,24 @@
+package collage
+
+import (
+	"embed"
+	"fmt"
+	"io/fs"
+	"testing"
+)
+
+//go:embed test_data/*
+var testData embed.FS
+
+func TestMake(t *testing.T) {
+	t.Log("Test was run")
+	ifs, err := fs.Sub(testData, "test_data")
+	if err != nil {
+		t.Fatalf("getting test_data subdir failed %v", err)
+	}
+	img1f, err := ifs.Open("img1.jpg")
+	if err != nil {
+		t.Fatalf("opening image failed %v", err)
+	}
+	fmt.Printf("%#v\n", img1f)
+}
diff --git a/go.mod b/go.mod
index 216f73c..d302191 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module go.balki.me/collage-maker
 
-go 1.20
+go 1.21
 
 require (
 	github.com/oliamb/cutter v0.2.2