on this building the architect used an elemental structure of concrete covered in thick glass. The aim was to create a strong visual contrast with the cross-buildings, which have masonry facades. this help the designers establish a groundbreaking approach to the problem of inserting new building into a preexisting architectural context.
in this diagrams the existing building is one of the importance aspect as shown on diagrams above that the building have s level difference between the existing building
This two section has limited structure detail of the building, but it very clear drawn the difference level of the new building and the existing, which is the main point of the building.
in my opinion, by putting some colour on the section it can define the section clearly and underline the difference level of the new and existing building.
The thin line in the back of the building section, showing the facade of the existing building and how it related to the new building.
reference:
Holl, S, 2009. Sketch: Public Building. LOFT Publications, Barcelona, Spain, pp. 126-133.