wha is blue

It seems like you're asking about the color blue in the context of Apple's WWDC presentations. Here are some relevant mentions of the color blue from the sessions:

1. Design great visionOS apps:

   • The Red Bull TV app used a dark blue background color as a cohesive branding element for their TV and mobile apps. However, when adapting to Vision Pro, they had to consider usability and the pass-through feature, leading them to use the blue color more sparingly (Design great visionOS apps).
   • The Red Bull team incorporated their dark blue brand color briefly as images were loading to maintain branding without compromising usability (Design great visionOS apps).

2. Say hello to the next generation of CarPlay design system:

   • The session discusses using blue to soften the impact of a bold gauge and help with overall hierarchy in the CarPlay design system (Say hello to the next generation of CarPlay design system).

3. Build a spatial drawing app with RealityKit:

   • The blue highlight on the handle is achieved using the highlight hover effect in RealityKit (Build a spatial drawing app with RealityKit).

4. What’s new in AppKit:

   • The session mentions using the app's accent color for text highlighting, which can be blue (What’s new in AppKit).

Relevant Sessions

• Design great visionOS apps
• Say hello to the next generation of CarPlay design system
• Build a spatial drawing app with RealityKit
• What’s new in AppKit

If you have any more specific questions or need further details, feel free to ask!