Why did diego rivera use symbolism, and what was the goal for his murals?

Look at las meninas by diego velasquez. this painting is a masterful example of the use of:

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Ineed this to be answered fast and you i would appreciate it1. what benefits are there to using an online filter app? 2. of the apps you researched, which would you choose to edit your own photos? why would you choose this app over the other ones? 3. if you could choose between using the camera accessory filters that connect to your camera or the photo editing app filters, which would you choose and why?