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Mario thinks he recognizes these from building 54. No, that's not it... maybe building 28? Something like that. It’s all Greek to him, but then mathematical expressions usually are.

• z=w³ with z, w ∈ ℂ near 0
• z² + 1 = x² + 4y², marked with lines of the form (tcos θ + sin θ,±(tsin θ − cos θ)/2,t) for various values of θ
• y² = x² − z³ + 3x²z
• x² + 2y² +3z² = 1, marked with curves in the principal directions. A point where the principal directions are not well-defined is indicated
• The shape of a soap film stretched between two parallel wire hoops
• z⁴ + 2z² + 1 = x² + y², marked with curves along which the normal curvature vanishes
• x² + y²/4 + z²/9 = 1 and z²/3 = 1 + x²/5 + y²/2
• z = Re{(x + iy)²}
• A surface, locally isometric to the hyperbolic plane, with an isolated singularity

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