Magenta halos are reflections from the windows, not chromatic aberration!
Here's an explanation from a National Geographic website about the museum: Light Show
South-facing liquid-filled crystal prisms catch the suns rays and reflect a rainbow-like light spectrum onto the interior of the entry hall, called the Potomac area. This light show changes every day and will be at its height from 11 a.m. to 2 p.m.