Making My A1 Poster

Working out my grid; how many images I could put on an A1 poster, and how big my gutters would need to be.

During the process of laying out my 10x10cm images on the A1 document.
I chose the size of 10cm x 10 cm as this is the size of petri dishes which relates my images back to science.
(N.B. I haven't considered the placement of each individual image to create diversity and flow at this point. I know that I want to mix up extreme close ups that are more ambiguous with images which give more of an idea of the body.)