diff --git a/src/Sheet.php b/src/Sheet.php
index e654667..1f8b0d7 100644
--- a/src/Sheet.php
+++ b/src/Sheet.php
@@ -2,7 +2,9 @@
 
 namespace Spatie\Sheets;
 
-class Sheet
+use ArrayAccess;
+
+class Sheet implements ArrayAccess
 {
     /** @var array */
     protected $attributes;
@@ -13,6 +15,46 @@ public function __construct(array $attributes = [])
     }
 
     public function __get(string $key)
+    {
+        return $this->getAttribute($key);
+    }
+
+    public function __set(string $key, $value)
+    {
+        $this->attributes[$key] = $value;
+    }
+
+    public function __isset(string $key)
+    {
+        return isset($this->attributes[$key]);
+    }
+
+    public function __unset(string $key)
+    {
+        unset($this->attributes[$key]);
+    }
+
+    public function offsetExists($key)
+    {
+        return !is_null($this->getAttribute($key));
+    }
+
+    public function offsetGet($key)
+    {
+        return $this->getAttribute($key);
+    }
+
+    public function offsetSet($key, $value)
+    {
+        $this->$key = $value;
+    }
+
+    public function offsetUnset($key)
+    {
+        unset($this->attributes[$key]);
+    }
+
+    protected function getAttribute(string $key)
     {
         $value = $this->attributes[$key] ?? null;
 
@@ -24,9 +66,4 @@ public function __get(string $key)
 
         return $value;
     }
-
-    public function __isset(string $key)
-    {
-        return ! is_null($this->$key);
-    }
 }
diff --git a/tests/SheetTest.php b/tests/SheetTest.php
new file mode 100644
index 0000000..633d80a
--- /dev/null
+++ b/tests/SheetTest.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace Spatie\Sheets\Tests;
+
+use ArrayAccess;
+use ReflectionClass;
+use Spatie\Sheets\Sheet;
+use PHPUnit\Framework\TestCase;
+
+class SheetTest extends TestCase
+{
+    /** @test */
+    public function it_can_create_a_sheet_with_attributes()
+    {
+        $attributes = [
+            'foo' => 'bar',
+            'hello' => 'world',
+        ];
+        $sheet = new Sheet($attributes);
+
+        $reflection = (new ReflectionClass($sheet))->getProperty('attributes');
+        $reflection->setAccessible(true);
+
+        $this->assertEquals($attributes, $reflection->getValue($sheet));
+    }
+
+    /** @test */
+    public function it_can_get_a_specific_attribute()
+    {
+        $sheet = new Sheet(['foo' => 'bar']);
+        
+        $this->assertEquals('bar', $sheet->foo);
+    }
+
+    /** @test */
+    public function it_can_get_null_for_a_non_existing_attribute()
+    {
+        $sheet = new Sheet();
+        
+        $this->assertNull($sheet->unknown);
+    }
+
+    /** @test */
+    public function it_can_set_a_specific_attribute()
+    {
+        $sheet = new Sheet();
+
+        $sheet->foo = 'bar';
+
+        $reflection = (new ReflectionClass($sheet))->getProperty('attributes');
+        $reflection->setAccessible(true);
+
+        $this->assertEquals(['foo' => 'bar'], $reflection->getValue($sheet));
+    }
+
+    /** @test */
+    public function it_can_be_extended_with_accessor()
+    {
+        $child = new class extends Sheet {
+            public function getFooAttribute($original)
+            {
+                return 'baz';
+            }
+        };
+
+        $sheet = new $child(['foo' => 'bar']);
+
+        $this->assertNotEquals('bar', $sheet->foo);
+        $this->assertEquals('baz', $sheet->foo);
+    }
+
+    /** @test */
+    public function it_implements_array_access()
+    {
+        $sheet = new Sheet(['foo' => 'bar']);
+
+        $this->assertInstanceOf(ArrayAccess::class, $sheet);
+        $this->assertEquals('bar', $sheet['foo']);
+        $this->assertNull($sheet['unknown']);
+
+        unset($sheet['foo']);
+        $this->assertNull($sheet['foo']);
+
+        $sheet['foo'] = 'baz';
+        $this->assertEquals('baz', $sheet['foo']);
+    }
+}