The use of different pen thickness in the drawing helps to demonstrate the structural details and particular fixtures and finishes. The addition of the quick sketch perspectives help the viewed to understand the plans of the space.
anna-vital: “ How To Think Visually Using Visual Analogies Most research in cognitive science explores how we see things but little research is done on how we understand what we see. Understanding is the ultimate test of how good your visualization.
grey white bathroom walk in shower designs decoration using grey concrete tile bathroom walls including clear glass shower door and in wall grey mosaic tile shower shelving. Fetching Bathroom Decoration with Bathroom Walk in Shower Design