With this markup you will be able to create beautiful and responsive isotope gallery.
HTML markup
| 
					 1 2 3 4 5 6 7  | 
						<div class="ct-isotope-gallery">   ...   <figure class="ct-isotope-item">     <img src="assets/images/example-image.jpg" alt="example" />   </figure>   ... </div>  | 
					
The first item should have a class isotope-grid-sizer
Screenshot

Isotope gallery